Search

Your search keyword '"Gelbord, J M"' showing total 40 results
Start Over Author "Gelbord, J M" Publication Year Range Last 10 years
40 results on '"Gelbord, J M"'

1. Space Telescope and Optical Reverberation Mapping Project. XII. Broad-Line Region Modeling of NGC 5548

Author

Williams, P. R., Pancoast, A., Treu, T., Brewer, B. J., Peterson, B. M., Barth, A. J., Malkan, M. A., De Rosa, G., Horne, Keith, Kriss, G. A., Arav, N., Bentz, M. C., Cackett, E. M., Bontà, E. Dalla, Dehghanian, M., Done, C., Ferland, G. J., Grier, C. J., Kaastra, J., Kara, E., Kochanek, C. S., Mathur, S., Mehdipour, M., Pogge, R. W., Proga, D., Vestergaard, M., Waters, T., Adams, S. M., Anderson, M. D., Arévalo, P., Beatty, T. G., Bennert, V. N., Bigley, A., Bisogni, S., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Brotherton, M., Brown, J. E., Brown, J. S., Canalizo, G., Carini, M. T., Clubb, K. I., Comerford, J. M., Corsini, E. M., Crenshaw, D. M., Croft, S., Croxall, K. V., Deason, A. J., De Lorenzo-Cáceres, A., Denney, K. D., Dietrich, M., Edelson, R., Efimova, N. V., Ely, J., Evans, P. A., Fausnaugh, M. M., Filippenko, A. V., Flatland, K., Fox, O. D., Gardner, E., Gates, E. L., Gehrels, N., Geier, S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Greene, J. E., Grupe, D., Gupta, A., Hall, P. B., Henderson, C. B., Hicks, S., Holmbeck, E., Holoien, T. W. -S., Hutchison, T., Im, M., Jensen, J. J., Johnson, C. A., Joner, M. D., Jones, J., Kaspi, S., Kelly, P. L., Kennea, J. A., Kim, M., Kim, S., Kim, S. C., King, A., Klimanov, S. A., Knigge, C., Krongold, Y., Lau, M. W., Lee, J. C., Leonard, D. C., Li, Miao, Lira, P., Lochhaas, C., Ma, Zhiyuan, Manne-Nicholas, E. R., MacInnis, F., Mauerhan, J. C., McGurk, R., Hardy, I. M. Mc, Montuori, C., Morelli, L., Mosquera, A., Mudd, D., Müller-Sánchez, F., Nazarov, S. V., Norris, R. P., Nousek, J. A., Nguyen, M. L., Ochner, P., Okhmat, D. N., Papadakis, I., Parks, J. R., Pei, L., Penny, M. T., Pizzella, A., Poleski, R., Pott, J. -U., Rafter, S. E., Rix, H. -W., Runnoe, J., Saylor, D. A., Schimoia, J. S., Scott, B., Sergeev, S. G., Shappee, B. J., Shivvers, I., Siegel, M., Simonian, G. V., Siviero, A., Skielboe, A., Somers, G., Spencer, M., Starkey, D., Stevens, D. J., Sung, H. -I., Tayar, J., Tejos, N., Turner, C. S., Uttley, P., Van Saders, J., Vaughan, S. A., Vican, L., Villanueva Jr., S., Villforth, C., Weiss, Y., Woo, J. -H., Yan, H., Young, S., Yuk, H., Zheng, W., Zhu, W., and Zu, Y.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We present geometric and dynamical modeling of the broad line region for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The dataset includes photometric and spectroscopic monitoring in the optical and ultraviolet, covering the H$\beta$, C IV, and Ly$\alpha$ broad emission lines. We find an extended disk-like H$\beta$ BLR with a mixture of near-circular and outflowing gas trajectories, while the C IV and Ly$\alpha$ BLRs are much less extended and resemble shell-like structures. There is clear radial structure in the BLR, with C IV and Ly$\alpha$ emission arising at smaller radii than the H$\beta$ emission. Using the three lines, we make three independent black hole mass measurements, all of which are consistent. Combining these results gives a joint inference of $\log_{10}(M_{\rm BH}/M_\odot) = 7.64^{+0.21}_{-0.18}$. We examine the effect of using the $V$ band instead of the UV continuum light curve on the results and find a size difference that is consistent with the measured UV-optical time lag, but the other structural and kinematic parameters remain unchanged, suggesting that the $V$ band is a suitable proxy for the ionizing continuum when exploring the BLR structure and kinematics. Finally, we compare the H$\beta$ results to similar models of data obtained in 2008 when the AGN was at a lower luminosity state. We find that the size of the emitting region increased during this time period, but the geometry and black hole mass remain unchanged, which confirms that the BLR kinematics suitably gauge the gravitational field of the central black hole., Comment: 26 pages, 19 figures, 1 table, accepted for publication in ApJ

Published
2020
Full Text
View/download PDF

2. Intensive disc-reverberation mapping of Fairall 9: 1st year of Swift & LCO monitoring

Author

Santisteban, J. V. Hernández, Edelson, R., Horne, K., Gelbord, J. M., Barth, A. J., Cackett, E. M., Goad, M. R., Netzer, H., Starkey, D., Uttley, P., Brandt, W. N., Korista, K., Lohfink, A. M., Onken, C. A., Page, K. L., Siegel, M., Vestergaard, M., Bisogni, S., Breeveld, A. A., Cenko, S. B., Bontà, E. Dalla, Evans, P. A., Ferland, G., Gonzalez-Buitrago, D. H., Grupe, D., Joner, M. D., Kriss, G., LaPorte, S. J., Mathur, S., Marshall, F., Mehdipour, M., Mudd, D., Peterson, B. M., Schmidt, T., Vaughan, S., and Valenti, S.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present results of time-series analysis of the first year of the Fairall 9 intensive disc-reverberation campaign. We used Swift and the Las Cumbres Observatory global telescope network to continuously monitor Fairall 9 from X-rays to near-infrared at a daily to sub-daily cadence. The cross-correlation function between bands provides evidence for a lag spectrum consistent with the $\tau\propto\lambda^{4/3}$ scaling expected for an optically thick, geometrically thin blackbody accretion disc. Decomposing the flux into constant and variable components, the variable component's spectral energy distribution is slightly steeper than the standard accretion disc prediction. We find evidence at the Balmer edge in both the lag and flux spectra for an additional bound-free continuum contribution that may arise from reprocessing in the broad-line region. The inferred driving light curve suggests two distinct components, a rapidly variable ($<4$ days) component arising from X-ray reprocessing, and a more slowly varying ($>100$ days) component with an opposite lag to the reverberation signal., Comment: 19 pages, 12 figures, accepted in MNRAS

Published
2020
Full Text
View/download PDF

3. Space Telescope and Optical Reverberation Mapping Project. XI. Disk-wind characteristics and contributions to the very broad emission lines of NGC 5548

Author

Dehghanian, M., Ferland, G. J., Kriss, G. A., Peterson, B. M., Korista, K. T., Goad, M. R., Chatzikos, M., Guzman, F., de Rosa, G., Mehdipour, M., Kaastra, J., Mathur, S., Vestergaard, M., Proga, D., Waters, T., Bentz, M. C., Bisogni, S., Brandt, W. N., Bont`a, E. Dalla, Fausnaugh, M. M., Gelbord, J. M., Horne, Keith, McHardy, I. M., Pogge, R. W., and Starkey, D. A.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
Abstract

In 2014 the NGC 5548 Space Telescope and Optical Reverberation Mapping campaign discovered a two-month anomaly when variations in the absorption and emission lines decorrelated from continuum variations. During this time the soft X-ray part of the intrinsic spectrum had been strongly absorbed by a line-of-sight (LOS) obscurer, which was interpreted as the upper part of a disk wind. Our first paper showed that changes in the LOS obscurer produce the decorrelation between the absorption lines and the continuum. A second study showed that the base of the wind shields the BLR, leading to the emission-line decorrelation. In that study, we proposed the wind is normally transparent with no effect on the spectrum. Changes in the wind properties alter its shielding and affect the SED striking the BLR, producing the observed decorrelations. In this work, we investigate the impact of a translucent wind on the emission lines. We simulate the obscuration using XMM-Newton, NuSTAR, and HST observations to determine the physical characteristics of the wind. We find that a translucent wind can contribute a part of the He II and Fe K? emission. It has a modest optical depth to electron scattering, which explains the fainter far-side emission in the observed velocity delay maps. The wind produces the very broad base seen in the UV emission lines and may also be present in the Fe K? line. Our results highlight the importance of accounting for the effects of such winds in the analysis of the physics of the central engine., Comment: Accepted for publication in ApJ

Published
2020
Full Text
View/download PDF

4. Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548

Author

Horne, Keith, De Rosa, G., Peterson, B. M., Barth, A. J., Ely, J., Fausnaugh, M. M., Kriss, G. A., Pei, L., Adams, S. M., Anderson, M. D., Arevalo, P., Beatty, T G., Bennert, V. N., Bentz, M. C., Bigley, A., Bisogni, S., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Brotherton, M., Brown, J. E., Brown, J. S., Cackett, E. M., Canalizo, G., Carini, M. T., Clubb, K. I., Comerford, J. M., Corsini, E. M., Crenshaw, D. M., Croft, S., Croxall, K. V., Bonta, E. Dalla, Deason, A. J., Dehghanian, M., De Lorenzo-Caceres, A., Denney, K. D., Dietrich, M., Done, C., Edelson, R., Efimova, N. V., Eracleous, M., Evans, P. A., Ferland, G. J., Filippenko, A. V., Flatland, K., Fox, O. D., Gardner, E., Gates, E. L., Gehrels, N., Geier, S., Gelbord, J. M., Goad, M. R., Gonzalez, L., Gorjian, V., Greene, J. E., Grier, C. J., Grupe, D., Gupta, A., Hall, P. B., Henderson, C. B., Hicks, S., Holmbeck, E., Holoien, T. W. -S., Hutchison, T., Im, M., Jensen, J. J., Johnson, C. A., Joner, M. D., Jones, J., Kaastra, J., Kaspi, S., Kelly, P. L., Kennea, J. A., Kim, M., Kim, S., Kim, S. C., King, A., Klimanov, S. A., Kochanek, C. S., Korista, K. T., Krongold, Y., Lau, M. W., Lee, J. C., Leonard, D. C., Li, Miao, Lira, P., Lochhaas, C., Ma, Zhiyuan, MacInnis, F., Malkan, M. A., Manne-Nicholas, E. R., Mathur, S., Mauerhan, J. C., McGurk, R., Hardy, I. M. Mc, Montuori, C., Morelli, L., Mosquera, A., Mudd, D., Mueller-Sanchez, F., Nazarov, S. V., Netzer, H., Norris, R. P., Nousek, J. A., Nguyen, M. L., Ochner, P., Okhmat, D. N., Pancoast, A., Papadakis, I., Parks, J. R., Penny, M. T., Pizzella, A., Pogge, R. W., Poleski, R., Pott, J. -U., Proga, D., Rafter, S. E., Rix, H. -W., Runnoe, J., Saylor, D. A., Schimoia, J. S., Schnuelle, K., Scott, B., Sergeev, S. G., Shappee, B. J., Shivvers, I., Siegel, M., Simonian, G. V., Siviero, A., Skielboe, A., Somers, G., Spencer, M., Starkey, D., Stevens, D. J., Strauss, M. A., Sung, H. -I., Tayar, J., Teems, K. G., Tejos, N., Treu, T., Turner, C. S., Uttley, P., Van Saders, J ., Vestergaard, M., Vican, L., Villanueva Jr, S., Villforth, C., Weiss, Y., Woo, J. -H., Yan, H., Young, S., Yuk, H., Zakamska, N. L., Zheng, W., Zhu, W., and Zu, Y.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We report velocity-delay maps for prominent broad emission lines, Ly_alpha, CIV, HeII and H_beta, in the spectrum of NGC5548. The emission-line responses inhabit the interior of a virial envelope. The velocity-delay maps reveal stratified ionization structure. The HeII response inside 5-10 light-days has a broad single-peaked velocity profile. The Ly_alpha, CIV, and H_beta responses peak inside 10 light-days, extend outside 20 light-days, and exhibit a velocity profile with two peaks separated by 5000 km/s in the 10 to 20 light-day delay range. The velocity-delay maps show that the M-shaped lag vs velocity structure found in previous cross-correlation analysis is the signature of a Keplerian disk with a well-defined outer edge at R=20 light-days. The outer wings of the M arise from the virial envelope, and the U-shaped interior of the M is the lower half of an ellipse in the velocity-delay plane. The far-side response is weaker than that from the near side, so that we see clearly the lower half, but only faintly the upper half, of the velocity--delay ellipse. The delay tau=(R/c)(1-sin(i))=5 light-days at line center is from the near edge of the inclined ring, giving the inclination i=45 deg. A black hole mass of M=7x10^7 Msun is consistent with the velocity-delay structure. A barber-pole pattern with stripes moving from red to blue across the CIV and possibly Ly_alpha line profiles suggests the presence of azimuthal structure rotating around the far side of the broad-line region and may be the signature of precession or orbital motion of structures in the inner disk. Further HST observations of NGC 5548 over a multi-year timespan but with a cadence of perhaps 10 days rather than 1 day could help to clarify the nature of this new AGN phenomenon., Comment: 19 pages, 9 figures, ApJ in press

Published
2020
Full Text
View/download PDF

5. Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

Author

Kriss, G. A., De Rosa, G., Ely, J., Peterson, B. M., Kaastra, J., Mehdipour, M., Ferland, G. J., Dehghanian, M., Mathur, S., Edelson, R., Korista, K. T., Arav, N., Barth, A. J., Bentz, M. C., Brandt, W. N., Crenshaw, D. M., Bontà, E. Dalla, Denney, K. D., Done, C., Eracleous, M., Fausnaugh, M. M., Gardner, E., Goad, M. R., Grier, C. J., Horne, Keith, Kochanek, C. S., Mchardy, I. M., Netzer, H., Pancoast, A., Pei, L., Pogge, R. W., Proga, D., Silva, C., Tejos, N., Vestergaard, M., Adams, S. M., Anderson, M. D., Arévalo, P., Beatty, T G., Behar, E., Bennert, V. N., Bianchi, S., Bigley, A., Bisogni, S., Boissay-Malaquin, R., Borman, G. A., Bottorff, M. C., Breeveld, A. A., Brotherton, M., Brown, J. E., Brown, J. S., Cackett, E. M., Canalizo, G., Cappi, M., Carini, M. T., Clubb, K. I., Comerford, J. M., Coker, C. T., Corsini, E. M., Costantini, E., Croft, S., Croxall, K. V., Deason, A. J., De Lorenzo-Cáceres, A., De Marco, B., Dietrich, M., Di Gesu, L., Ebrero, J., Evans, P. A., Filippenko, A. V., Flatland, K., Gates, E. L., Gehrels, N., Geier, Z S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Grupe, D., Gupta, A., Hall, P. B., Henderson, C. B., Hicks, S., Holmbeck, E., Holoien, T. W. -S., Hutchison, T. A., Im, M., Jensen, J. J., Johnson, C. A., Joner, M. D., Kaspi, S., Kelly, B. C., Kelly, P. L., Kennea, J. A., Kim, M., Kim, S. C., Kim, S. Y., King, A., Klimanov, S. A., Krongold, Y., Lau, M. W., Lee, J. C., Leonard, D. C., Li, Miao, Lira, P., Lochhaas, C., Ma, Zhiyuan, Macinnis, F., Malkan, M. A., Manne-Nicholas, E. R., Matt, G., Mauerhan, J. C., Mcgurk, R., Montuori, C., Morelli, L., Mosquera, A., Mudd, D., Müller-Sánchez, F., Nazarov, S. V., Norris, R. P., Nousek, J. A., Nguyen, M. L., Ochner, P., Okhmat, D. N., Paltani, S., Parks, J. R., Pinto, C., Pizzella, A., Poleski, R., Ponti, G., Pott, J. -U., Rafter, S. E., Rix, H. -W., Runnoe, J., Saylor, D. A., Schimoia, J. S., Schnülle, K., Scott, B., Sergeev, S. G., Shappee, B. J., Shivvers, I., Siegel, M., Simonian, G. V., Siviero, A., Skielboe, A., Somers, G., Spencer, M., Starkey, D., Stevens, D. J., Sung, H. -I., Tayar, J., Teems, K. G., Treu, T., Turner, C. S., Uttley, P., Van Saders, J ., Vican, L., Villforth, C., Villanueva Jr., S., Walton, D. J., Waters, T., Weiss, Y., Woo, J. -H., Yan, H., Yuk, H., Zheng, W., Zhu, W., and Zu, Y.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We model the ultraviolet spectra of the Seyfert 1 galaxy NGC~5548 obtained with the Hubble Space Telescope during the 6-month reverberation-mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblends the individual emission lines. Using the modeled spectra, we measure the response to continuum variations for the deblended and absorption-corrected individual broad emission lines, the velocity-dependent profiles of Ly$\alpha$ and C IV, and the narrow and broad intrinsic absorption features. We find that the time lags for the corrected emission lines are comparable to those for the original data. The velocity-binned lag profiles of Ly$\alpha$ and C IV have a double-peaked structure indicative of a truncated Keplerian disk. The narrow absorption lines show delayed response to continuum variations corresponding to recombination in gas with a density of $\sim 10^5~\rm cm^{-3}$. The high-ionization narrow absorption lines decorrelate from continuum variations during the same period as the broad emission lines. Analyzing the response of these absorption lines during this period shows that the ionizing flux is diminished in strength relative to the far-ultraviolet continuum. The broad absorption lines associated with the X-ray obscurer decrease in strength during this same time interval. The appearance of X-ray obscuration in $\sim\,2012$ corresponds with an increase in the luminosity of NGC 5548 following an extended low state. We suggest that the obscurer is a disk wind triggered by the brightening of NGC 5548 following the decrease in size of the broad-line region during the preceding low-luminosity state., Comment: 50 pages, 30 figures, uses aastex62.cls. Accepted for publication in ApJ, 07/06/2019. High-level products page in MAST will go live after 7/15/2019. Replaced Figure 4 on 7/12/2019 to be more red/green color-blind friendly

Published
2019
Full Text
View/download PDF

6. Space Telescope and Optical Reverberation Mapping Project. X. Understanding the Absorption-Line Holiday in NGC 5548

Author

Dehghanian, M., Ferland, G. J., Kriss, G. A., Peterson, B. M., Mathur, S., Mehdipour, M., Guzman, F., Chatzikos, M., Van Hoof, P. A. M., Williams, R. J. R., Arav, N., Barth, A. J., Bentz, M. C., Bisogni, S., Brandt, W. N., Crenshaw, D. M., Bonta, E. Dalla, De Rosa, G., Fausnaugh, M. M., Gelbord, J. M., Goad, M. R., Gupta, A., Horne, Keith, Kaastra, J., Knigge, C., Korista, K. T., Hardy, I. M. Mc, Pogge, R. W., Starkey, D. A., and Vestergaard, M.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

The flux variations in the emission lines in active galactic nuclei (AGNs) are driven by variations in the ionizing continuum flux --which are usually reflected in the observable UV-optical continuum. The "Reverberation mapping" technique measures the delay between line and continuum variations to determine the size of the line emitting region, this is the basis for measurements of the central black hole mass in AGNs. The Space Telescope and Optical Reverberation Mapping Project (AGN STORM) on NGC 5548 in 2014 is the most intensive multi-wavelength AGN monitoring campaign ever. For most of the campaign, the emission-line variations followed changes in the continuum with a time lag, as expected. However, the lines varied independently of the observed UV-optical continuum during a 60 -- 70 day "holiday." To understand this remarkable phenomenon, we study the intrinsic absorption lines present in NGC 5548. We identify a novel cycle that reproduces the absorption line variability and thus identify the physics that allows the holiday to occur. In our model, variations in this obscurer's line-of-sight covering factor modify the soft X-ray continuum. This leads to changes in the ionization of helium gas in the broad-line region. Ionizing radiation produced by recombining helium then affects the ionization of other species as observed during the AGN STORM holiday. It is likely that any other model which selectively changes the soft X-ray part of the continuum during the holiday can also explain the anomalous emission line behavior observed., Comment: This is the version accepted by ApJ. Will be published shortly

Published
2018
Full Text
View/download PDF

7. An X-ray Imaging Survey of Quasar Jets -- The Complete Survey

Author

Marshall, H. L., Gelbord, J. M., Worrall, D. M., Birkinshaw, M., Schwartz, D. A., Jauncey, D. L., Griffiths, G., Murphy, D. W., Lovell, J. E. J., Perlman, E. S., and Godfrey, L.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present Chandra X-ray imaging of a flux-limited sample of flat spectrum radio-emitting quasars with jet-like structure. X-rays are detected from 59% of 56 jets. No counterjets were detected. The core spectra are fitted by power law spectra with photon index $\Gamma_x$ whose distribution is consistent with a normal distribution with mean 1.61{+0.04}{-0.05} and dispersion 0.15{+0.04}{-0.03}. We show that the distribution of $\alpha_{rx}$, the spectral index between the X-ray and radio band jet fluxes, fits a Gaussian with mean 0.974 $\pm$ 0.012 and dispersion 0.077 $\pm$ 0.008. We test the model in which kpc-scale X-rays result from inverse Compton scattering of cosmic microwave background photons off the jet's relativistic electrons (the IC-CMB model). In the IC-CMB model, a quantity Q computed from observed fluxes and the apparent size of the emission region depends on redshift as $(1+z)^{3+\alpha}$. We fit $Q \propto (1+z)^{a}$, finding $a = 0.88 \pm 0.90$ and reject at 99.5% confidence the hypothesis that the average $\alpha_{rx}$ depends on redshift in the manner expected in the IC-CMB model. This conclusion is mitigated by lack of detailed knowledge of the emission region geometry, which requires deeper or higher resolution X-ray observations. Furthermore, if the IC-CMB model is valid for X-ray emission from kpc-scale jets, then the jets must decelerate on average: bulk Lorentz factors should drop from about 15 to 2-3 between pc and kpc scales. Our results compound the problems that the IC-CMB model has in explaining the X-ray emission of kpc-scale jets., Comment: 41 pages, 15 figures, accepted for publication in the Astrophysical Journal Supplements

Published
2018
Full Text
View/download PDF

8. Space Telescope and Optical Reverberation Mapping Project. VII. Understanding the UV anomaly in NGC 5548 with X-Ray Spectroscopy

Author

Mathur, S., Gupta, A., Page, K., Pogge, R. W., Krongold, Y., Goad, M. R., Adams, S. M., Anderson, M. D., Arevalo, P., Barth, A. J., Bazhaw, C., Beatty, T. G., Bentz, M. C., Bigley, A., Bisogni, S., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Brown, J. E., Brown, J. S., Cackett, E. M., Canalizo, G., Carini, M. T., Clubb, K. I., Comerford, J. M., Coker, C. T., Corsini, E. M., Crenshaw, D. M., Croft, S., Croxall, K. V., Bonta, E. Dalla, Deason, A. J., Denney, K. D., De Lorenzo-Caceres, A., De Rosa, G., Dietrich, M., Edelson, R., Ely, J., Eracleous, M., Evans, P. A., Fausnaugh, M. M., Ferland, G. J., Filippenko, A. V., Flatland, K., Fox, O. D., Gates, E. L., Gehrels, N., Geier, S., Gelbord, J. M., Gorjian, V., Greene, J. E., Grier, C. J., Grupe, D., Hall, P. B., Henderson, C. B., Hicks, S., Holmbeck, E., Holoien, T. W. -S., Horenstein, D., Horne, Keith, Hutchison, T., Im, M., Jensen, J. J., Johnson, C. A., Joner, M. D., Jones, J., Kaastra, J., Kaspi, S., Kelly, B. C., Kelly, P. L., Kennea, J. A., Kim, M., Kim, S., Kim, S. C., King, A., Klimanov, S. A., Kochanek, C. S., Korista, K. T., Kriss, G. A., Lau, M. W., Lee, J. C., Leonard, D. C., Li, M., Lira, P., Ma, Z., MacInnis, F., Manne-Nicholas, E. R., Malkan, M. A., Mauerhan, J. C., McGurk, R., McHardy, I. M., Montouri, C., Morelli, L., Mosquera, A., Mudd, D., Muller-Sanchez, F., Musso, R., Nazarov, S. V., Netzer, H., Nguyen, M. L., Norris, R. P., Nousek, J. A., Ochner, P., Okhmat, D. N., Ou-Yang, B., Pancoast, A., Papadakis, I., Parks, J. R., Pei, L., Peterson, B. M., Pizzella, A., Poleski, R., Pott, J. -U., Rafter, S. E., Rix, H. -W., Runnoe, J., Saylor, D. A., Schimoia, J. S., Schnülle, K., Sergeev, S. G., Shappee, B. J., Shivvers, I., Siegel, M., Simonian, G. V., Siviero, A., Skielboe, A., Somers, G., Spencer, M., Starkey, D., Stevens, D. J., Sung, H. -I., Tayar, J., Tejos, N., Turner, C. S., Uttley, P., Van Saders, J., Vestergaard, M., Vican, L., VillanuevaJr., S., Villforth, C., Weiss, Y., Woo, J. -H., Yan, H., Young, S., Yuk, H., Zheng, W., Zhu, W., and Zu, Y.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

During the Space Telescope and Optical Reverberation Mapping Project (STORM) observations of NGC 5548, the continuum and emission-line variability became de-correlated during the second half of the 6-month long observing campaign. Here we present Swift and Chandra X-ray spectra of NGC 5548 obtained as a part of the campaign. The Swift spectra show that excess flux (relative to a power-law continuum) in the soft X-ray band appears before the start of the anomalous emission-line behavior, peaks during the period of the anomaly, and then declines. This is a model-independent result suggesting that the soft excess is related to the anomaly. We divide the Swift data into on- and off-anomaly spectra to characterize the soft excess via spectral fitting. The cause of the spectral differences is likely due to a change in the intrinsic spectrum rather than being due to variable obscuration or partial covering. The Chandra spectra have lower signal-to-noise ratios, but are consistent with Swift data. Our preferred model of the soft excess is emission from an optically thick, warm Comptonizing corona, the effective optical depth of which increases during the anomaly. This model simultaneously explains all the three observations: the UV emission line flux decrease, the soft-excess increase, and the emission line anomaly., Comment: ApJ in press. Replaced with the accepted version

Published
2017
Full Text
View/download PDF

9. Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-Line Analysis for NGC 5548

Author

Pei, L., Fausnaugh, M. M., Barth, A. J., Peterson, B. M., Bentz, M. C., De Rosa, G., Denney, K. D., Goad, M. R., Kochanek, C. S., Korista, K. T., Kriss, G. A., Pogge, R. W., Bennert, V. N., Brotherton, M., Clubb, K. I., Bontà, E. Dalla, Filippenko, A. V., Greene, J. E., Grier, C. J., Vestergaard, M., Zheng, W., Adams, Scott M., Beatty, Thomas G., Bigley, A., Brown, Jacob E., Brown, Jonathan S., Canalizo, G., Comerford, J. M., Coker, Carl T., Corsini, E. M., Croft, S., Croxall, K. V., Deason, A. J., Eracleous, Michael, Fox, O. D., Gates, E. L., Henderson, C. B., Holmbeck, E., Holoien, T. W. -S., Jensen, J. J., Johnson, C. A., Kelly, P. L., Kim, S., King, A., Lau, M. W., Li, Miao, Lochhaas, Cassandra, Ma, Zhiyuan, Manne-Nicholas, E. R., Mauerhan, J. C., Malkan, M. A., McGurk, R., Morelli, L., Mosquera, Ana, Mudd, Dale, Sanchez, F. Muller, Nguyen, M. L., Ochner, P., Ou-Yang, B., Pancoast, A., Penny, Matthew T., Pizzella, A., Poleski, Radosław, Runnoe, Jessie, Scott, B., Schimoia, Jaderson S., Shappee, B. J., Shivvers, I., Simonian, Gregory V., Siviero, A., Somers, Garrett, Stevens, Daniel J., Strauss, M. A., Tayar, Jamie, Tejos, N., Treu, T., Van Saders, J., Vican, L., Villanueva Jr., S., Yuk, H., Zakamska, N. L., Zhu, W., Anderson, M. D., Arévalo, P., Bazhaw, C., Bisogni, S., Borman, G. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Cackett, E. M., Carini, M. T., Crenshaw, D. M., De Lorenzo-Cáceres, A., Dietrich, M., Edelson, R., Efimova, N. V., Ely, J., Evans, P. A., Ferland, G. J., Flatland, K., Gehrels, N., Geier, S., Gelbord, J. M., Grupe, D., Gupta, A., Hall, P. B., Hicks, S., Horenstein, D., Horne, Keith, Hutchison, T., Im, M., Joner, M. D., Jones, J., Kaastra, J., Kaspi, S., Kelly, B. C., Kennea, J. A., Kim, M., Kim, S. C., Klimanov, S. A., Lee, J. C., Leonard, D. C., Lira, P., MacInnis, F., Mathur, S., McHardy, I. M., Montouri, C., Musso, R., Nazarov, S. V., Netzer, H., Norris, R. P., Nousek, J. A., Okhmat, D. N., Papadakis, I., Parks, J. R., Pott, J. -U., Rafter, S. E., Rix, H. -W., Saylor, D. A., Schnülle, K., Sergeev, S. G., Siegel, M., Skielboe, A., Spencer, M., Starkey, D., Sung, H. -I., Teems, K. G., Turner, C. S., Uttley, P., Villforth, C., Weiss, Y., Woo, J. -H., Yan, H., Young, S., and Zu, Y.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We present the results of an optical spectroscopic monitoring program targeting NGC 5548 as part of a larger multi-wavelength reverberation mapping campaign. The campaign spanned six months and achieved an almost daily cadence with observations from five ground-based telescopes. The H$\beta$ and He II $\lambda$4686 broad emission-line light curves lag that of the 5100 $\AA$ optical continuum by $4.17^{+0.36}_{-0.36}$ days and $0.79^{+0.35}_{-0.34}$ days, respectively. The H$\beta$ lag relative to the 1158 $\AA$ ultraviolet continuum light curve measured by the Hubble Space Telescope is roughly $\sim$50% longer than that measured against the optical continuum, and the lag difference is consistent with the observed lag between the optical and ultraviolet continua. This suggests that the characteristic radius of the broad-line region is $\sim$50% larger than the value inferred from optical data alone. We also measured velocity-resolved emission-line lags for H$\beta$ and found a complex velocity-lag structure with shorter lags in the line wings, indicative of a broad-line region dominated by Keplerian motion. The responses of both the H$\beta$ and He II $\lambda$4686 emission lines to the driving continuum changed significantly halfway through the campaign, a phenomenon also observed for C IV, Ly $\alpha$, He II(+O III]), and Si IV(+O IV]) during the same monitoring period. Finally, given the optical luminosity of NGC 5548 during our campaign, the measured H$\beta$ lag is a factor of five shorter than the expected value implied by the $R_\mathrm{BLR} - L_\mathrm{AGN}$ relation based on the past behavior of NGC 5548., Comment: 22 pages, 13 figures, accepted to ApJ

Published
2017
Full Text
View/download PDF

10. Space Telescope and Optical Reverberation Mapping Project VI: reverberating Disk Models for NGC 5548

Author

Starkey, D., Horne, Keith, Fausnaugh, M. M., Peterson, B. M., Bentz, M. C., Kochanek, C. S., Denney, K. D., Edelson, R., Goad, M. R., De Rosa, G., Anderson, M. D., Arevalo, P., Barth, A. J., Bazhaw, C., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Cackett, E. M., Carini, M. T., Croxall, K. V., Crenshaw, D. M., Bonta, E. Dalla, De Lorenzo-Caceres, A., Dietrich, M., Efimova, N. V., Ely, J., Evans, P. A., Filippenko, A. V., Flatland, K., Gehrels, N., Geier, S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Grier, C. J., Grupe, D., Hall, P. B., Hicks, S., Horenstein, D., Hutchison, T., Im, M., Jensen, J. J., Joner, M. D., Jones, J., Kaastra, J., Kaspi, S., Kelly, B. C., Kennea, J. A., Kim, S. C., Kim, M., Klimanov, S. A., Korista, K. T., Kriss, G. A., Lee, J. C., Leonard, D. C., Lira, P., MacInnis, F., Manne-Nicholas, E. R., Mathur, S., McHardy, I. M., Montouri, C., Musso, R., Nazarov, S. V., Norris, R. P., Nousek, J. A., Okhmat, D. N., Pancoast, A., Parks, J. R., Pei, L., Pogge, R. W., Pott, J. -U., Rafter, S. E., Rix, H. W., Saylor, D. A., Schimoia, J. S., Schnulle, K., Sergeev, S. G., Siegel, M. H., Spencer, M., Sung, H. -I., Teems, K. G., Turner, C. S., Uttley, P., Vestergaard, M., Villforth, C., Weiss, Y., Woo, J. -H., Yan, H., Young, S., Zheng, W., and Zu, Y.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We conduct a multiwavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate the temperature structure of its accretion disk. The 19 overlapping continuum light curves (1158 to 9157 angstroms) combine simultaneous HST , Swift , and ground-based observations over a 180 day period from 2014 January to July. Light-curve variability is interpreted as the reverberation response of the accretion disk to irradiation by a central time-varying point source. Our model yields the disk inclination, i, temperature T1 at 1 light day from the black hole, and a temperature-radius slope, alpha. We also infer the driving light curve and find that it correlates poorly with both the hard and soft X-ray light curves, suggesting that the X-rays alone may not drive the ultraviolet and optical variability over the observing period. We also decompose the light curves into bright, faint, and mean accretion-disk spectra. These spectra lie below that expected for a standard blackbody accretion disk accreting at L/LEdd = 0.1, Comment: V2: Oops wrong title! V1: Accepted for publication in ApJ, 20 Pages, 11 Figures

Published
2016
Full Text
View/download PDF

11. Space Telescope and Optical Reverberation Mapping Project. III. Optical Continuum Emission and Broad-Band Time Delays in NGC 5548

Author

Fausnaugh, M. M., Denney, K. D., Barth, A. J., Bentz, M. C., Bottorff, M. C., Carini, M. T., Croxall, K. V., De Rosa, G., Goad, M. R., Horne, Keith, Joner, M. D., Kaspi, S., Kim, M., Klimanov, S. A., Kochanek, C. S., Leonard, D. C., Netzer, H., Peterson, B. M., Schnulle, K., Sergeev, S. G., Vestergaard, M., Zheng, W. -K., Zu, Y., Anderson, M. D., Arevalo, P., Bazhaw, C., Borman, G. A., Boroson, T. A., Brandt, W. N., Breeveld, A. A., Brewer, B. J., Cackett, E. M., Crenshaw, D. M., Bonta, E. Dalla, De Lorenzo-Caceres, A., Dietrich, M., Edelson, R., Efimova, N. V., Ely, J., Evans, P. A., Filippenko, A. V., Flatland, K., Gehrels, N., Geier, S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Grier, C. J., Grupe, D., Hall, P. B., Hicks, S., Horenstein, D., Hutchison, T., Im, M., Jensen, J. J., Jones, J., Kaastra, J., Kelly, B. C., Kennea, J. A., Kim, S. C., Korista, K. T., Kriss, G. A., Lee, J. C., Lira, P., MacInnis, F., Manne-Nicholas, E. R., Mathur, S., McHardy, I. M., Montouri, C., Musso, R., Nazarov, S. V., Norris, R. P., Nousek, J. A., Okhmat, D. N., Pancoast, A., Papadakis, I., Parks, J. R., Pei, L., Pogge, R. W., Pott, J. -U., Rafter, S. E., Rix, H. -W., Saylor, D. A., Schimoia, J. S., Siegel, M., Spencer, M., Starkey, D., Sung, H. -I., Teems, K. G., Treu, T., Turner, C. S., Uttley, P., Villforth, C., Weiss, Y., Woo, J. -H., Yan, H., and Young, S.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multi-wavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters (\emph{BVRI} and \emph{ugriz}). Combined with ultraviolet data from the \emph{Hubble Space Telescope} and \emph{Swift}, we confirm significant time delays between the continuum bands as a function of wavelength, extending the wavelength coverage from 1158\,\AA\ to the $z$ band ($\sim\!9160$\,\AA). We find that the lags at wavelengths longer than the {\it V} band are equal to or greater than the lags of high-ionization-state emission lines (such as He\,{\sc ii}\,$\lambda 1640$ and $\lambda 4686$), suggesting that the continuum-emitting source is of a physical size comparable to the inner broad-line region (BLR). The trend of lag with wavelength is broadly consistent with the prediction for continuum reprocessing by an accretion disk with $\tau \propto \lambda^{4/3}$. However, the lags also imply a disk radius that is 3 times larger than the prediction from standard thin-disk theory, assuming that the bolometric luminosity is 10\% of the Eddington luminosity ($L = 0.1L_{\rm Edd}$). Using optical spectra from the Large Binocular Telescope, we estimate the bias of the interband continuum lags due to BLR emission observed in the filters. We find that the bias for filters with high levels of BLR contamination ($\sim\! 20\%$) can be important for the shortest continuum lags, and likely has a significant impact on the {\it u} and {\it U} bands owing to Balmer continuum emission., Comment: 26 pages, 10 figures, accepted to ApJ. For a brief video describing the main results of this paper, please see: https://www.youtube.com/watch?v=yaYtcDvIoP0&feature=youtu.be

Published
2015
Full Text
View/download PDF

12. Space Telescope and Optical Reverberation Mapping Project. I. Ultraviolet Observations of the Seyfert 1 Galaxy NGC 5548 with the Cosmic Origins Spectrograph on Hubble Space Telescope

Author

De Rosa, G., Peterson, B. M., Ely, J., Kriss, G. A., Crenshaw, D. M., Horne, Keith, Korista, K. T., Netzer, H., Pogge, R. W., Arevalo, P., Barth, A. J., Bentz, M. C., Brandt, W. N., Breeveld, A. A., Brewer, B. J., Bonta, E. Dalla, De Lorenzo-Caceres, A., Denney, K. D., Dietrich, M., Edelson, R., Evans, P. A., Fausnaugh, M. M., Gehrels, N., Gelbord, J. M., Goad, M. R., Grier, C. J., Grupe, D., Hall, P. B., Kaastra, J., Kelly, B. C., Kennea, J. A., Kochanek, C. S., Lira, P., Mathur, S., McHardy, I. M., Nousek, J. A., Pancoast, A., Papadakis, I., Pei, L., Schimoia, J. S., Siegel, M., Starkey, D., Treu, T., Uttley, P., Vaughan, S., Vestergaard, M., Villforth, C., Yan, H., Young, S., and Zu, Y.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We describe the first results from a six-month long reverberation-mapping experiment in the ultraviolet based on 170 observations of the Seyfert 1 galaxy NGC 5548 with the Cosmic Origins Spectrograph on the Hubble Space Telescope. Significant correlated variability is found in the continuum and broad emission lines, with amplitudes ranging from ~30% to a factor of two in the emission lines and a factor of three in the continuum. The variations of all the strong emission lines lag behind those of the continuum, with He II 1640 lagging behind the continuum by ~2.5 days and Lyman alpha 1215, C IV 1550, and Si IV 1400 lagging by ~5-6 days. The relationship between the continuum and emission lines is complex. In particular, during the second half of the campaign, all emission-line lags increased by a factor of 1.3-2 and differences appear in the detailed structure of the continuum and emission-line light curves. Velocity-resolved cross-correlation analysis shows coherent structure in lag versus line-of-sight velocity for the emission lines; the high-velocity wings of C IV respond to continuum variations more rapidly than the line core, probably indicating higher velocity BLR clouds at smaller distances from the central engine. The velocity-dependent response of Lyman alpha, however, is more complex and will require further analysis., Comment: Accepted for publication in The Astrophysical Journal. 20 pages, 6 figures, 4 tables. See also STORM Paper II "Space telescope and optical reverberation mapping project. II. Reverberation mapping of the accretion disk with SWIFT and HST" by R. Edelson et al

Published
2015
Full Text
View/download PDF

13. Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548

Author

Edelson, R., Gelbord, J. M., Horne, K., McHardy, I. M., Peterson, B. M., Arevalo, P., Breeveld, A. A., De Rosa, G., Evans, P. A., Goad, M. R., Kriss, G. A., Brandt, W. N., Gehrels, N., Grupe, D., Kennea, J. A., Kochanek, C. S., Nousek, J. A., Papadakis, I., Siegel, M., Starkey, D., Uttley, P., Vaughan, S., Young, S., Barth, A. J., Bentz, M. C., Brewer, B. J., Crenshaw, D. M., Bonta, E. Dalla, De Lorenzo-Caceres, A., Denney, K. D., Dietrich, M., Ely, J., Fausnaugh, M. M., Grier, C. J., Hall, P. B., Kaastra, J., Kelly, B. C., Korista, K. T., Lira, P., Mathur, S., Netzer, H., Pancoast, A., Pei, L., Pogge, R. W., Schimoia, J. S., Treu, T., Vestergaard, M., Villforth, C., Yan, H., and Zu, Y.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Recent intensive Swift monitoring of the Seyfert 1 galaxy NGC 5548 yielded 282 usable epochs over 125 days across six UV/optical bands and the X-rays. This is the densest extended AGN UV/optical continuum sampling ever obtained, with a mean sampling rate <0.5 day. Approximately daily HST UV sampling was also obtained. The UV/optical light curves show strong correlations (r_max = 0.57 - 0.90) and the clearest measurement to date of interband lags. These lags are well-fit by a \tau propto \lambda^4/3 wavelength dependence, with a normalization that indicates an unexpectedly large disk radius of 0.35 +/- 0.05 lt-day at 1367 A, assuming a simple face-on model. The U-band shows a marginally larger lag than expected from the fit and surrounding bands, which could be due to Balmer continuum emission from the broad-line region as suggested by Korista and Goad. The UV/X-ray correlation is weaker (r_max < 0.45) and less consistent over time. This indicates that while Swift is beginning to measure UV/optical lags in general agreement with accretion disk theory (although the derived size is larger than predicted), the relationship with X-ray variability is less well understood. Combining this accretion disk size estimate with those from quasar microlensing studies suggests that AGN disk sizes scale approximately linearly with central black hole mass over a wide range of masses., Comment: Accepted for publication in the Astrophysical Journal. Seventeen pages, 10 figures, 6 tables. See also STORM Paper I: "Space Telescope and Optical Reverberation Mapping Project. I. Ultraviolet Observations of the Seyfert 1 Galaxy NGC 5548 with the Cosmic Origins Spectrograph on Hubble Space Telescope" by G. De Rosa et al., http://arxiv.org/abs/1501.05954

Published
2015
Full Text
View/download PDF

14. Swift follow-up of IceCube triggers, and implications for the Advanced-LIGO era

Author

Evans, P. A., Osborne, J. P., Kennea, J. A., Smith, M., Palmer, D. M., Gehrels, N., Gelbord, J. M., Homeier, A., Voge, M., Strotjohann, N. L., Cowen, D. F., Boeser, S., Kowalski, M., and Stasik, A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Between 2011 March and 2014 August Swift responded to 20 triggers from the IceCube neutrino observatory, observing the IceCube 50% confidence error circle in X-rays, typically within 5 hours of the trigger. No confirmed counterpart has been detected. We describe the Swift follow up strategy and data analysis and present the results of the campaign. We discuss the challenges of distinguishing the X-ray counterpart to a neutrino trigger from serendipitous uncatalogued X-ray sources in the error circle, and consider the implications of our results for future strategies for multi-messenger astronomy, with particular reference to the follow up of gravitational wave triggers from the advanced-era detectors., Comment: Accepted for publication in MNRAS. 18 pages, including 8 figures and 4 tables; two of which are landscape-oriented

Published
2015
Full Text
View/download PDF

15. Space Telescope and Optical Reverberation Mapping Project. VI. Reverberating Disk Models for NGS 5548

Author

Starkey, D, Gehrels, Cornelis, Horne, Keith, Fausnaugh, M. M, Peterson, B. M, Bentz, M. C, Kochanek, C. S, Denney, K. D, Edelson, R, Goad, M. R, De Rosa, G, Anderson, M. D, Arevalo, P, Barth, A. J, Bazhaw, C, Borman, G. A, Boroson, T. A, Bottorff, M. C, Brandt, W. N, Breeveld, A. A, Cackett E. M, Carini, M. T, Croxall, K. V, Crenshaw, D. M, Dalla Bonta, E, De Lorenzo-Caceres, A, Dietrich, M, Efimova, N. V, Ely, J, Evans, P. A, Filippenko, A. V, Flatland, I, Gehrels, N, Geier, S, Gelbord, J. M, Gonzalez, L, Gorjian, V, Grier, C. J, Grupe, D, Hall, P. B, Hicks, S, Horenstein, D, Hutchison, T, Im, M, Jensen, J. J, Joner, M. D, Jones, J, Kaastra, J, Kaspi, S, Kelly, B. C, Kennea, J. A, Kim, S. C, Kim, M, Kilmanov, S. A, Korista, K. T, Kriss, G. A, Lee, J. C, Leonard, D. C, Lira, P, MacInnis, F, Manne-Nicholas, E. R, Mathur, S, McHardy, I. M, Montouri, C, Musso, R, Nazarov, S. V, Norris, R. P, Nousek, J. A, Okhmat, D. N, Pancoast, A, Parks, J. R, Pei, L, Pogge, R. W, Pott, J.-U, Rafter, S. E, Rix, H.-W, Saylor, D. A, Schimoia, J. S, Schnuelle, K, Sergeev, S. G, Siegel, M. H, Spencer, M, Sung, H. I, Teems, K. G, Turner, C. S, Uttley, P, Vestergaard, M, Villforth, C, Weiss, Y, Woo, J.-H, Yan, H, Young, S, Zheng, W, and Zu, Y

Subjects
Astrophysics
Abstract

We conduct a multi-wavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate the temperature structure of its accretion disk. The 19 overlapping continuum light curves (1158 Angstrom to 9157 Angstrom) combine simultaneous Hubble Space Telescope, Swift, and ground-based observations over a 180 day period from 2014 January to July. Light-curve variability is interpreted as the reverberation response of the accretion disk to irradiation by a central time-varying point source. Our model yields the disk inclination i = 36deg +/- 10deg, temperature T(sub 1) = (44+/-6) times 10 (exp 3)K at 1 light day from the black hole, and a temperature radius slope (T proportional to r (exp -alpha)) of alpha = 0.99 +/- 0.03. We also infer the driving light curve and find that it correlates poorly with both the hard and soft X-ray light curves, suggesting that the X-rays alone may not drive the ultraviolet and optical variability over the observing period. We also decompose the light curves into bright, faint, and mean accretion-disk spectra. These spectra lie below that expected for a standard blackbody accretion disk accreting at L/L(sub Edd) = 0.1.

Published
2017
Full Text
View/download PDF

16. Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548

Author

Horne, Keith, Rosa, G. De, Peterson, B. M., Barth, A. J., Ely, J., Fausnaugh, M. M., Kriss, G. A., Pei, L., Bentz, M. C., Cackett, E. M., Edelson, R., Eracleous, M., Goad, M. R., Grier, C. J., Kaastra, J., Kochanek, C. S., Krongold, Y., Mathur, S., Netzer, H., Proga, D., Tejos, N., Vestergaard, M., Villforth, C., Adams, S. M., Anderson, M. D., Arevalo, P., Beatty, T. G., Bennert, V. N., Bigley, A., Bisogni, S., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Brotherton, M., Brown, J. E., Brown, J. S., Canalizo, G., Carini, M. T., Clubb, K. I., Comerford, J. M., Corsini, E. M., Crenshaw, D. M., Croft, S., Croxall, K. V., Bonta, E. Dalla, Deason, A. J., Dehghanian, M., Lorenzo-Caceres, A. De, Denney, K. D., Dietrich, M., Done, C., Efimova, N. V., Evans, P. A., Ferland, G. J., Filippenko, A. V., Flatland, K., Fox, O. D., Gardner, E., Gates, E. L., Gehrels, N., Geier, S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Greene, J. E., Grupe, D., Gupta, A., Hall, P. B., Henderson, C. B., Hicks, S., Holmbeck, E., Holoien, T. W. -S., Hutchison, T., Im, M., Jensen, J. J., Johnson, C. A., Joner, M. D., Jones, J., Kaspi, S., Kelly, P. L., Kennea, J. A., Kim, M., Kim, S., Kim, S. C., King, A., Klimanov, S. A., Korista, K. T., Lau, M. W., Lee, J. C., Leonard, D. C., Li, Miao, Lira, P., Lochhaas, C., Ma, Zhiyuan, MacInnis, F., Malkan, M. A., Manne-Nicholas, E. R., Mauerhan, J. C., McGurk, R., McHardy, I. M., Montuori, C., Morelli, L., Mosquera, A., Mudd, D., Muller-Sanchez, F., Nazarov, S. V., Norris, R. P., Nousek, J. A., Nguyen, M. L., Ochner, P., Okhmat, D. N., Pancoast, A., Papadakis, I., Parks, J. R., Penny, M. T., Pizzella, A., Pogge, R. W., Poleski, R., Pott, J. -U., Rafter, S. E., Rix, H. -W., Runnoe, J., Saylor, D. A., Schimoia, J. S., Schnuelle, K., Scott, B., Sergeev, S. G., Shappee, B. J., Shivvers, I., Siegel, M., Simonian, G. V., Siviero, A., Skielboe, A., Somers, G., Spencer, M., Starkey, D., Stevens, D. J., Sung, H. -I., Tayar, J., Treu, T., Turner, C. S., Uttley, P., Van Saders, J., Vican, L., Villanueva, S., Weiss, Y., Woo, J. -H., Yan, H., Young, S., Yuk, H., Zheng, W., Zhu, W., Zu, Y., Horne, Keith, Rosa, G. De, Peterson, B. M., Barth, A. J., Ely, J., Fausnaugh, M. M., Kriss, G. A., Pei, L., Bentz, M. C., Cackett, E. M., Edelson, R., Eracleous, M., Goad, M. R., Grier, C. J., Kaastra, J., Kochanek, C. S., Krongold, Y., Mathur, S., Netzer, H., Proga, D., Tejos, N., Vestergaard, M., Villforth, C., Adams, S. M., Anderson, M. D., Arevalo, P., Beatty, T. G., Bennert, V. N., Bigley, A., Bisogni, S., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Brotherton, M., Brown, J. E., Brown, J. S., Canalizo, G., Carini, M. T., Clubb, K. I., Comerford, J. M., Corsini, E. M., Crenshaw, D. M., Croft, S., Croxall, K. V., Bonta, E. Dalla, Deason, A. J., Dehghanian, M., Lorenzo-Caceres, A. De, Denney, K. D., Dietrich, M., Done, C., Efimova, N. V., Evans, P. A., Ferland, G. J., Filippenko, A. V., Flatland, K., Fox, O. D., Gardner, E., Gates, E. L., Gehrels, N., Geier, S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Greene, J. E., Grupe, D., Gupta, A., Hall, P. B., Henderson, C. B., Hicks, S., Holmbeck, E., Holoien, T. W. -S., Hutchison, T., Im, M., Jensen, J. J., Johnson, C. A., Joner, M. D., Jones, J., Kaspi, S., Kelly, P. L., Kennea, J. A., Kim, M., Kim, S., Kim, S. C., King, A., Klimanov, S. A., Korista, K. T., Lau, M. W., Lee, J. C., Leonard, D. C., Li, Miao, Lira, P., Lochhaas, C., Ma, Zhiyuan, MacInnis, F., Malkan, M. A., Manne-Nicholas, E. R., Mauerhan, J. C., McGurk, R., McHardy, I. M., Montuori, C., Morelli, L., Mosquera, A., Mudd, D., Muller-Sanchez, F., Nazarov, S. V., Norris, R. P., Nousek, J. A., Nguyen, M. L., Ochner, P., Okhmat, D. N., Pancoast, A., Papadakis, I., Parks, J. R., Penny, M. T., Pizzella, A., Pogge, R. W., Poleski, R., Pott, J. -U., Rafter, S. E., Rix, H. -W., Runnoe, J., Saylor, D. A., Schimoia, J. S., Schnuelle, K., Scott, B., Sergeev, S. G., Shappee, B. J., Shivvers, I., Siegel, M., Simonian, G. V., Siviero, A., Skielboe, A., Somers, G., Spencer, M., Starkey, D., Stevens, D. J., Sung, H. -I., Tayar, J., Treu, T., Turner, C. S., Uttley, P., Van Saders, J., Vican, L., Villanueva, S., Weiss, Y., Woo, J. -H., Yan, H., Young, S., Yuk, H., Zheng, W., Zhu, W., and Zu, Y.

Abstract

In this contribution, we achieve the primary goal of the active galactic nucleus (AGN) STORM campaign by recovering velocity-delay maps for the prominent broad emission lines (Ly alpha, C IV, He II, and H beta) in the spectrum of NGC 5548. These are the most detailed velocity-delay maps ever obtained for an AGN, providing unprecedented information on the geometry, ionization structure, and kinematics of the broad-line region. Virial envelopes enclosing the emission-line responses show that the reverberating gas is bound to the black hole. A stratified ionization structure is evident. The He ii response inside 5-10 lt-day has a broad single-peaked velocity profile. The Ly alpha, C IV, and H beta responses extend from inside 2 to outside 20 lt-day, with double peaks at 2500 km s(-1) in the 10-20 lt-day delay range. An incomplete ellipse in the velocity-delay plane is evident in H beta. We interpret the maps in terms of a Keplerian disk with a well-defined outer rim at R = 20 lt-day. The far-side response is weaker than that from the near side. The line-center delay tau = (R/c)(1 - sin i) approximate to 5 days gives the inclination i approximate to 45 degrees. The inferred black hole mass is (BH) 7 x 10(7) M-circle dot. In addition to reverberations, the fit residuals confirm that emission-line fluxes are depressed during the "BLR Holiday" identified in previous work. Moreover, a helical "Barber-Pole" pattern, with stripes moving from red to blue across the C IV and Ly alpha line profiles, suggests azimuthal structure rotating with a 2 yr period that may represent precession or orbital motion of inner-disk structures casting shadows on the emission-line region farther out.

Published
2021

17. Intensive disc-reverberation mapping of Fairall 9: 1st year of Swift & LCO monitoring

Author

Santisteban, J. V. Hern��ndez, Edelson, R., Horne, K., Gelbord, J. M., Barth, A. J., Cackett, E. M., Goad, M. R., Netzer, H., Starkey, D., Uttley, P., Brandt, W. N., Korista, K., Lohfink, A. M., Onken, C. A., Page, K. L., Siegel, M., Vestergaard, M., Bisogni, S., Breeveld, A. A., Cenko, S. B., Bont��, E. Dalla, Evans, P. A., Ferland, G., Gonzalez-Buitrago, D. H., Grupe, D., Joner, M. D., Kriss, G., LaPorte, S. J., Mathur, S., Marshall, F., Mehdipour, M., Mudd, D., Peterson, B. M., Schmidt, T., Vaughan, S., and Valenti, S.

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics of Galaxies (astro-ph.GA), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies, Astrophysics::Galaxy Astrophysics
Abstract

We present results of time-series analysis of the first year of the Fairall 9 intensive disc-reverberation campaign. We used Swift and the Las Cumbres Observatory global telescope network to continuously monitor Fairall 9 from X-rays to near-infrared at a daily to sub-daily cadence. The cross-correlation function between bands provides evidence for a lag spectrum consistent with the $\tau\propto\lambda^{4/3}$ scaling expected for an optically thick, geometrically thin blackbody accretion disc. Decomposing the flux into constant and variable components, the variable component's spectral energy distribution is slightly steeper than the standard accretion disc prediction. We find evidence at the Balmer edge in both the lag and flux spectra for an additional bound-free continuum contribution that may arise from reprocessing in the broad-line region. The inferred driving light curve suggests two distinct components, a rapidly variable ($100$ days) component with an opposite lag to the reverberation signal., Comment: 19 pages, 12 figures, accepted in MNRAS

Published
2020

18. Intensive disc-reverberation mapping of Fairall 9: 1st year of Swift and LCO monitoring

Author

Santisteban, J V Hernández, Edelson, R, Horne, K, Gelbord, J M, Barth, A J, Cackett, E M, Goad, M R, Netzer, H, Starkey, D, Uttley, P, Brandt, W N, Korista, K, Lohfink, A M, Onken, C A, Page, K L, Siegel, M, Vestergaard, M, Bisogni, S, Breeveld, A A, Cenko, S B, Dalla Bontà, E, Evans, P A, Ferland, G, Gonzalez-Buitrago, D H, Grupe, D, Joner, M D, Kriss, G, Laporte, S J, Mathur, S, Marshall, F, Mehdipour, M, Mudd, D, Peterson, B M, Schmidt, T, Vaughan, S, and Valenti, S

Published
2020

19. Intensive disc-reverberation mapping of Fairall 9:first year of Swift and LCO monitoring

Author

Santisteban, J. V. Hernandez, Edelson, R., Horne, K., Gelbord, J. M., Barth, A. J., Cackett, E. M., Goad, M. R., Netzer, H., Starkey, D., Uttley, P., Brandt, W. N., Korista, K., Lohfink, A. M., Onken, C. A., Page, K. L., Siegel, M., Vestergaard, M., Bisogni, S., Breeveld, A. A., Cenko, S. B., Dalla Bonta, E., Evans, P. A., Ferland, G., Gonzalez-Buitrago, D. H., Grupe, D., Joner, M. D., Kriss, G., LaPorte, S. J., Mathur, S., Marshall, F., Mehdipour, M., Mudd, D., Peterson, B. M., Schmidt, T., Vaughan, S., Valenti, S., Santisteban, J. V. Hernandez, Edelson, R., Horne, K., Gelbord, J. M., Barth, A. J., Cackett, E. M., Goad, M. R., Netzer, H., Starkey, D., Uttley, P., Brandt, W. N., Korista, K., Lohfink, A. M., Onken, C. A., Page, K. L., Siegel, M., Vestergaard, M., Bisogni, S., Breeveld, A. A., Cenko, S. B., Dalla Bonta, E., Evans, P. A., Ferland, G., Gonzalez-Buitrago, D. H., Grupe, D., Joner, M. D., Kriss, G., LaPorte, S. J., Mathur, S., Marshall, F., Mehdipour, M., Mudd, D., Peterson, B. M., Schmidt, T., Vaughan, S., and Valenti, S.

Abstract

We present results of time-series analysis of the first year of the Fairall 9 intensive disc-reverberation campaign. We used Swift and the Las Cumbres Observatory global telescope network to continuously monitor Fairall 9 from X-rays to near-infrared at a daily to subdaily cadence. The cross-correlation function between bands provides evidence for a lag spectrum consistent with the tau proportional to lambda(4/3) scaling expected for an optically thick, geometrically thin blackbody accretion disc. Decomposing the flux into constant and variable components, the variable component's spectral energy distribution is slightly steeper than the standard accretion disc prediction. We find evidence at the Balmer edge in both the lag and flux spectra for an additional bound-free continuum contribution that may arise from reprocessing in the broad-line region. The inferred driving light curve suggests two distinct components, a rapidly variable (100 d) component with an opposite lag to the reverberation signal.

Published
2020

20. Space Telescope and Optical Reverberation Mapping Project. IX. Velocity–Delay Maps for Broad Emission Lines in NGC 5548

Author

Horne, Keith, primary, Rosa, G. De, additional, Peterson, B. M., additional, Barth, A. J., additional, Ely, J., additional, Fausnaugh, M. M., additional, Kriss, G. A., additional, Pei, L., additional, Bentz, M. C., additional, Cackett, E. M., additional, Edelson, R., additional, Eracleous, M., additional, Goad, M. R., additional, Grier, C. J., additional, Kaastra, J., additional, Kochanek, C. S., additional, Krongold, Y., additional, Mathur, S., additional, Netzer, H., additional, Proga, D., additional, Tejos, N., additional, Vestergaard, M., additional, Villforth, C., additional, Adams, S. M., additional, Anderson, M. D., additional, Arévalo, P., additional, Beatty, T G., additional, Bennert, V. N., additional, Bigley, A., additional, Bisogni, S., additional, Borman, G. A., additional, Boroson, T. A., additional, Bottorff, M. C., additional, Brandt, W. N., additional, Breeveld, A. A., additional, Brotherton, M., additional, Brown, J. E., additional, Brown, J. S., additional, Canalizo, G., additional, Carini, M. T., additional, Clubb, K. I., additional, Comerford, J. M., additional, Corsini, E. M., additional, Crenshaw, D. M., additional, Croft, S., additional, Croxall, K. V., additional, Bontà, E. Dalla, additional, Deason, A. J., additional, Dehghanian, M., additional, Lorenzo-Cáceres, A. De, additional, Denney, K. D., additional, Dietrich, M., additional, Done, C., additional, Efimova, N. V., additional, Evans, P. A., additional, Ferland, G. J., additional, Filippenko, A. V., additional, Flatland, K., additional, Fox, O. D., additional, Gardner, E., additional, Gates, E. L., additional, Gehrels, N., additional, Geier, S., additional, Gelbord, J. M., additional, Gonzalez, L., additional, Gorjian, V., additional, Greene, J. E., additional, Grupe, D., additional, Gupta, A., additional, Hall, P. B., additional, Henderson, C. B., additional, Hicks, S., additional, Holmbeck, E., additional, Holoien, T. W.-S., additional, Hutchison, T., additional, Im, M., additional, Jensen, J. J., additional, Johnson, C. A., additional, Joner, M. D., additional, Jones, J., additional, Kaspi, S., additional, Kelly, P. L., additional, Kennea, J. A., additional, Kim, M., additional, Kim, S., additional, Kim, S. C., additional, King, A., additional, Klimanov, S. A., additional, Korista, K. T., additional, Lau, M. W., additional, Lee, J. C., additional, Leonard, D. C., additional, Li, Miao, additional, Lira, P., additional, Lochhaas, C., additional, Ma, Zhiyuan, additional, MacInnis, F., additional, Malkan, M. A., additional, Manne-Nicholas, E. R., additional, Mauerhan, J. C., additional, McGurk, R., additional, McHardy, I. M., additional, Montuori, C., additional, Morelli, L., additional, Mosquera, A., additional, Mudd, D., additional, Müller–Sánchez, F., additional, Nazarov, S. V., additional, Norris, R. P., additional, Nousek, J. A., additional, Nguyen, M. L., additional, Ochner, P., additional, Okhmat, D. N., additional, Pancoast, A., additional, Papadakis, I., additional, Parks, J. R., additional, Penny, M. T., additional, Pizzella, A., additional, Pogge, R. W., additional, Poleski, R., additional, Pott, J.-U., additional, Rafter, S. E., additional, Rix, H.-W., additional, Runnoe, J., additional, Saylor, D. A., additional, Schimoia, J. S., additional, Schnülle, K., additional, Scott, B., additional, Sergeev, S. G., additional, Shappee, B. J., additional, Shivvers, I., additional, Siegel, M., additional, Simonian, G. V., additional, Siviero, A., additional, Skielboe, A., additional, Somers, G., additional, Spencer, M., additional, Starkey, D., additional, Stevens, D. J., additional, Sung, H.-I., additional, Tayar, J., additional, Treu, T., additional, Turner, C. S., additional, Uttley, P., additional, Van Saders, J., additional, Vican, L., additional, Villanueva, S., additional, Weiss, Y., additional, Woo, J.-H., additional, Yan, H., additional, Young, S., additional, Yuk, H., additional, Zheng, W., additional, Zhu, W., additional, and Zu, Y., additional

Published
2021
Full Text
View/download PDF

21. Space Telescope and Optical Reverberation Mapping Project. XII. Broad-line Region Modeling of NGC 5548

Author

Williams, P. R., primary, Pancoast, A., additional, Treu, T., additional, Brewer, B. J., additional, Peterson, B. M., additional, Barth, A. J., additional, Malkan, M. A., additional, Rosa, G. De, additional, Horne, Keith, additional, Kriss, G. A., additional, Arav, N., additional, Bentz, M. C., additional, Cackett, E. M., additional, Bontà, E. Dalla, additional, Dehghanian, M., additional, Done, C., additional, Ferland, G. J., additional, Grier, C. J., additional, Kaastra, J., additional, Kara, E., additional, Kochanek, C. S., additional, Mathur, S., additional, Mehdipour, M., additional, Pogge, R. W., additional, Proga, D., additional, Vestergaard, M., additional, Waters, T., additional, Adams, S. M., additional, Anderson, M. D., additional, Arévalo, P., additional, Beatty, T. G., additional, Bennert, V. N., additional, Bigley, A., additional, Bisogni, S., additional, Borman, G. A., additional, Boroson, T. A., additional, Bottorff, M. C., additional, Brandt, W. N., additional, Breeveld, A. A., additional, Brotherton, M., additional, Brown, J. E., additional, Brown, J. S., additional, Canalizo, G., additional, Carini, M. T., additional, Clubb, K. I., additional, Comerford, J. M., additional, Corsini, E. M., additional, Crenshaw, D. M., additional, Croft, S., additional, Croxall, K. V., additional, Deason, A. J., additional, Lorenzo-Cáceres, A. De, additional, Denney, K. D., additional, Dietrich, M., additional, Edelson, R., additional, Efimova, N. V., additional, Ely, J., additional, Evans, P. A., additional, Fausnaugh, M. M., additional, Filippenko, A. V., additional, Flatland, K., additional, Fox, O. D., additional, Gardner, E., additional, Gates, E. L., additional, Gehrels, N., additional, Geier, S., additional, Gelbord, J. M., additional, Gonzalez, L., additional, Gorjian, V., additional, Greene, J. E., additional, Grupe, D., additional, Gupta, A., additional, Hall, P. B., additional, Henderson, C. B., additional, Hicks, S., additional, Holmbeck, E., additional, Holoien, T. W.-S., additional, Hutchison, T., additional, Im, M., additional, Jensen, J. J., additional, Johnson, C. A., additional, Joner, M. D., additional, Jones, J., additional, Kaspi, S., additional, Kelly, P. L., additional, Kennea, J. A., additional, Kim, M., additional, Kim, S., additional, Kim, S. C., additional, King, A., additional, Klimanov, S. A., additional, Knigge, C., additional, Krongold, Y., additional, Lau, M. W., additional, Lee, J. C., additional, Leonard, D. C., additional, Li, Miao, additional, Lira, P., additional, Lochhaas, C., additional, Ma, Zhiyuan, additional, MacInnis, F., additional, Manne-Nicholas, E. R., additional, Mauerhan, J. C., additional, McGurk, R., additional, McHardy, I. M., additional, Montuori, C., additional, Morelli, L., additional, Mosquera, A., additional, Mudd, D., additional, Müller–Sánchez, F., additional, Nazarov, S. V., additional, Norris, R. P., additional, Nousek, J. A., additional, Nguyen, M. L., additional, Ochner, P., additional, Okhmat, D. N., additional, Papadakis, I., additional, Parks, J. R., additional, Pei, L., additional, Penny, M. T., additional, Pizzella, A., additional, Poleski, R., additional, Pott, J.-U., additional, Rafter, S. E., additional, Rix, H.-W., additional, Runnoe, J., additional, Saylor, D. A., additional, Schimoia, J. S., additional, Scott, B., additional, Sergeev, S. G., additional, Shappee, B. J., additional, Shivvers, I., additional, Siegel, M., additional, Simonian, G. V., additional, Siviero, A., additional, Skielboe, A., additional, Somers, G., additional, Spencer, M., additional, Starkey, D., additional, Stevens, D. J., additional, Sung, H.-I., additional, Tayar, J., additional, Tejos, N., additional, Turner, C. S., additional, Uttley, P., additional, Van Saders, J ., additional, Vaughan, S. A., additional, Vican, L., additional, Villanueva, S., additional, Villforth, C., additional, Weiss, Y., additional, Woo, J.-H., additional, Yan, H., additional, Young, S., additional, Yuk, H., additional, Zheng, W., additional, Zhu, W., additional, and Zu, Y., additional

Published
2020
Full Text
View/download PDF

22. Intensive disc-reverberation mapping of Fairall 9: first year of Swift and LCO monitoring

Author

Hernández Santisteban, J V, primary, Edelson, R, additional, Horne, K, additional, Gelbord, J M, additional, Barth, A J, additional, Cackett, E M, additional, Goad, M R, additional, Netzer, H, additional, Starkey, D, additional, Uttley, P, additional, Brandt, W N, additional, Korista, K, additional, Lohfink, A M, additional, Onken, C A, additional, Page, K L, additional, Siegel, M, additional, Vestergaard, M, additional, Bisogni, S, additional, Breeveld, A A, additional, Cenko, S B, additional, Dalla Bontà, E, additional, Evans, P A, additional, Ferland, G, additional, Gonzalez-Buitrago, D H, additional, Grupe, D, additional, Joner, M D, additional, Kriss, G, additional, LaPorte, S J, additional, Mathur, S, additional, Marshall, F, additional, Mehdipour, M, additional, Mudd, D, additional, Peterson, B M, additional, Schmidt, T, additional, Vaughan, S, additional, and Valenti, S, additional

Published
2020
Full Text
View/download PDF

23. Space Telescope and Optical Reverberation Mapping Project. XI. Disk-wind Characteristics and Contributions to the Very Broad Emission Lines of NGC 5548

Author

Dehghanian, M., primary, Ferland, G. J., additional, Kriss, G. A., additional, Peterson, B. M., additional, Korista, K. T., additional, Goad, M. R., additional, Chatzikos, M., additional, Guzmán, F., additional, Rosa, G. De, additional, Mehdipour, M., additional, Kaastra, J., additional, Mathur, S., additional, Vestergaard, M., additional, Proga, D., additional, Waters, T., additional, Bentz, M. C., additional, Bisogni, S., additional, Brandt, W. N., additional, Bontà, E. Dalla, additional, Fausnaugh, M. M., additional, Gelbord, J. M., additional, Horne, Keith, additional, McHardy, I. M., additional, Pogge, R. W., additional, and Starkey, D. A., additional

Published
2020
Full Text
View/download PDF

24. Space Telescope and Optical Reverberation Mapping Project. X. Understanding the Absorption-line Holiday in NGC 5548

Author

Dehghanian, M., Ferland, G. J., Kriss, G. A., Peterson, B. M., Mathur, S., Mehdipour, M., Guzmán, F., Chatzikos, M., Van Hoof, P. A.M., Williams, R. J.R., Arav, N., Barth, A. J., Bentz, M. C., Bisogni, S., Brandt, W. N., Crenshaw, D. M., Bonta, E. Dalla, De Rosa, G., Fausnaugh, M. M., Gelbord, J. M., Goad, M. R., Gupta, A., Horne, Keith, Kaastra, J., Knigge, C., Korista, K. T., McHardy, I. M., Pogge, R. W., Starkey, D. A., Vestergaard, M., Dehghanian, M., Ferland, G. J., Kriss, G. A., Peterson, B. M., Mathur, S., Mehdipour, M., Guzmán, F., Chatzikos, M., Van Hoof, P. A.M., Williams, R. J.R., Arav, N., Barth, A. J., Bentz, M. C., Bisogni, S., Brandt, W. N., Crenshaw, D. M., Bonta, E. Dalla, De Rosa, G., Fausnaugh, M. M., Gelbord, J. M., Goad, M. R., Gupta, A., Horne, Keith, Kaastra, J., Knigge, C., Korista, K. T., McHardy, I. M., Pogge, R. W., Starkey, D. A., and Vestergaard, M.

Abstract

The Space Telescope and Optical Reverberation Mapping Project (AGN STORM) on NGC 5548 in 2014 is one of the most intensive multiwavelength AGN monitoring campaigns ever. For most of the campaign, the emission-line variations followed changes in the continuum with a time lag, as expected. However, the lines varied independently of the observed UV-optical continuum during a 60-70 day "holiday," suggesting that unobserved changes to the ionizing continuum were present. To understand this remarkable phenomenon and to obtain an independent assessment of the ionizing continuum variations, we study the intrinsic absorption lines present in NGC 5548. We identify a novel cycle that reproduces the absorption line variability and thus identify the physics that allows the holiday to occur. In this cycle, variations in this obscurer's line-of-sight covering factor modify the soft X-ray continuum, changing the ionization of helium. Ionizing radiation produced by recombining helium then affects the level of ionization of some ions seen by the Hubble Space Telescope. In particular, high-ionization species are affected by changes in the obscurer covering factor, which does not affect the optical or UV continuum, and thus appear as uncorrelated changes, a "holiday." It is likely that any other model that selectively changes the soft X-ray part of the continuum during the holiday can also explain the anomalous emission-line behavior observed.

Published
2019

25. Space Telescope and Optical Reverberation Mapping Project. X. Understanding the Absorption-line Holiday in NGC 5548

Author

Physics, Dehghanian, M., Ferland, G. J., Kriss, G. A., Peterson, B. M., Mathur, S., Mehdipour, M., Guzman, F., Chatzikos, M., van Hoof, P. A. M., Williams, R. J. R., Arav, Nahum, Barth, A. J., Bentz, M. C., Bisogni, S., Brandt, W. N., Crenshaw, D. M., Dalla Bonta, E., De Rosa, G., Fausnaugh, M. M., Gelbord, J. M., Goad, M. R., Gupta, A., Horne, Keith, Kaastra, J., Knigge, C., Korista, K. T., McHardy, I. M., Pogge, R. W., Starkey, D. A., Vestergaard, M., Physics, Dehghanian, M., Ferland, G. J., Kriss, G. A., Peterson, B. M., Mathur, S., Mehdipour, M., Guzman, F., Chatzikos, M., van Hoof, P. A. M., Williams, R. J. R., Arav, Nahum, Barth, A. J., Bentz, M. C., Bisogni, S., Brandt, W. N., Crenshaw, D. M., Dalla Bonta, E., De Rosa, G., Fausnaugh, M. M., Gelbord, J. M., Goad, M. R., Gupta, A., Horne, Keith, Kaastra, J., Knigge, C., Korista, K. T., McHardy, I. M., Pogge, R. W., Starkey, D. A., and Vestergaard, M.

Abstract

The Space Telescope and Optical Reverberation Mapping Project (AGN STORM) on NGC 5548 in 2014 is one of the most intensive multiwavelength AGN monitoring campaigns ever. For most of the campaign, the emission-line variations followed changes in the continuum with a time lag, as expected. However, the lines varied independently of the observed UV-optical continuum during a 60-70 day "holiday," suggesting that unobserved changes to the ionizing continuum were present. To understand this remarkable phenomenon and to obtain an independent assessment of the ionizing continuum variations, we study the intrinsic absorption lines present in NGC 5548. We identify a novel cycle that reproduces the absorption line variability and thus identify the physics that allows the holiday to occur. In this cycle, variations in this obscurer's line-of-sight covering factor modify the soft X-ray continuum, changing the ionization of helium Ionizing radiation produced by recombining helium then affects the level of ionization of some ions seen by the Hubble Space Telescope. In particular, high-ionization species are affected by changes in the obscurer covering factor, which does not affect the optical or UV continuum, and thus appear as uncorrelated changes, a "holiday." It is likely that any other model that selectively changes the soft X-ray part of the continuum during the holiday can also explain the anomalous emission-line behavior observed.

Published
2019

26. Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

Author

Kriss, G. A., primary, De Rosa, G., additional, Ely, J., additional, Peterson, B. M., additional, Kaastra, J., additional, Mehdipour, M., additional, Ferland, G. J., additional, Dehghanian, M., additional, Mathur, S., additional, Edelson, R., additional, Korista, K. T., additional, Arav, N., additional, Barth, A. J., additional, Bentz, M. C., additional, Brandt, W. N., additional, Crenshaw, D. M., additional, Bontà, E. Dalla, additional, Denney, K. D., additional, Done, C., additional, Eracleous, M., additional, Fausnaugh, M. M., additional, Gardner, E., additional, Goad, M. R., additional, Grier, C. J., additional, Horne, Keith, additional, Kochanek, C. S., additional, McHardy, I. M., additional, Netzer, H., additional, Pancoast, A., additional, Pei, L., additional, Pogge, R. W., additional, Proga, D., additional, Silva, C., additional, Tejos, N., additional, Vestergaard, M., additional, Adams, S. M., additional, Anderson, M. D., additional, Arévalo, P., additional, Beatty, T G., additional, Behar, E., additional, Bennert, V. N., additional, Bianchi, S., additional, Bigley, A., additional, Bisogni, S., additional, Boissay-Malaquin, R., additional, Borman, G. A., additional, Bottorff, M. C., additional, Breeveld, A. A., additional, Brotherton, M., additional, Brown, J. E., additional, Brown, J. S., additional, Cackett, E. M., additional, Canalizo, G., additional, Cappi, M., additional, Carini, M. T., additional, Clubb, K. I., additional, Comerford, J. M., additional, Coker, C. T., additional, Corsini, E. M., additional, Costantini, E., additional, Croft, S., additional, Croxall, K. V., additional, Deason, A. J., additional, De Lorenzo-Cáceres, A., additional, De Marco, B., additional, Dietrich, M., additional, Di Gesu, L., additional, Ebrero, J., additional, Evans, P. A., additional, Filippenko, A. V., additional, Flatland, K., additional, Gates, E. L., additional, Gehrels, N., additional, Geier, S., additional, Gelbord, J. M., additional, Gonzalez, L., additional, Gorjian, V., additional, Grupe, D., additional, Gupta, A., additional, Hall, P. B., additional, Henderson, C. B., additional, Hicks, S., additional, Holmbeck, E., additional, Holoien, T. W.-S., additional, Hutchison, T. A., additional, Im, M., additional, Jensen, J. J., additional, Johnson, C. A., additional, Joner, M. D., additional, Kaspi, S., additional, Kelly, B. C., additional, Kelly, P. L., additional, Kennea, J. A., additional, Kim, M., additional, Kim, S. C., additional, Kim, S. Y., additional, King, A., additional, Klimanov, S. A., additional, Krongold, Y., additional, Lau, M. W., additional, Lee, J. C., additional, Leonard, D. C., additional, Li, Miao, additional, Lira, P., additional, Lochhaas, C., additional, Ma, Zhiyuan, additional, MacInnis, F., additional, Malkan, M. A., additional, Manne-Nicholas, E. R., additional, Matt, G., additional, Mauerhan, J. C., additional, McGurk, R., additional, Montuori, C., additional, Morelli, L., additional, Mosquera, A., additional, Mudd, D., additional, Müller-Sánchez, F., additional, Nazarov, S. V., additional, Norris, R. P., additional, Nousek, J. A., additional, Nguyen, M. L., additional, Ochner, P., additional, Okhmat, D. N., additional, Paltani, S., additional, Parks, J. R., additional, Pinto, C., additional, Pizzella, A., additional, Poleski, R., additional, Ponti, G., additional, Pott, J.-U., additional, Rafter, S. E., additional, Rix, H.-W., additional, Runnoe, J., additional, Saylor, D. A., additional, Schimoia, J. S., additional, Schnülle, K., additional, Scott, B., additional, Sergeev, S. G., additional, Shappee, B. J., additional, Shivvers, I., additional, Siegel, M., additional, Simonian, G. V., additional, Siviero, A., additional, Skielboe, A., additional, Somers, G., additional, Spencer, M., additional, Starkey, D., additional, Stevens, D. J., additional, Sung, H.-I., additional, Tayar, J., additional, Teems, K. G., additional, Treu, T., additional, Turner, C. S., additional, Uttley, P., additional, Van Saders, J ., additional, Vican, L., additional, Villforth, C., additional, Villanueva Jr., S., additional, Walton, D. J., additional, Waters, T., additional, Weiss, Y., additional, Woo, J.-H., additional, Yan, H., additional, Yuk, H., additional, Zheng, W., additional, Zhu, W., additional, and Zu, Y., additional

Published
2019
Full Text
View/download PDF

27. Space Telescope and Optical Reverberation Mapping Project. X. Understanding the Absorption-line Holiday in NGC 5548

Author

Dehghanian, M., primary, Ferland, G. J., additional, Kriss, G. A., additional, Peterson, B. M., additional, Mathur, S., additional, Mehdipour, M., additional, Guzmán, F., additional, Chatzikos, M., additional, van Hoof, P. A. M., additional, Williams, R. J. R., additional, Arav, N., additional, Barth, A. J., additional, Bentz, M. C., additional, Bisogni, S., additional, Brandt, W. N., additional, Crenshaw, D. M., additional, Bontà, E. Dalla, additional, De Rosa, G., additional, Fausnaugh, M. M., additional, Gelbord, J. M., additional, Goad, M. R., additional, Gupta, A., additional, Horne, Keith, additional, Kaastra, J., additional, Knigge, C., additional, Korista, K. T., additional, McHardy, I. M., additional, Pogge, R. W., additional, Starkey, D. A., additional, and Vestergaard, M., additional

Published
2019
Full Text
View/download PDF

28. An X-Ray Imaging Survey of Quasar Jets: The Complete Survey

Author

Marshall, H. L., primary, Gelbord, J. M., additional, Worrall, D. M., additional, Birkinshaw, M., additional, Schwartz, D. A., additional, Jauncey, D. L., additional, Griffiths, G., additional, Murphy, D. W., additional, Lovell, J. E. J., additional, Perlman, E. S., additional, and Godfrey, L., additional

Published
2018
Full Text
View/download PDF

29. SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. VI. REVERBERATING DISK MODELS FOR NGC 5548

Author

Starkey, D., Horne, Keith, Fausnaugh, M. M., Peterson, B. M., Bentz, M. C., Kochanek, C. S., Denney, K. D., Edelson, R., Goad, M. R., De Rosa, G., Anderson, M. D., Arevalo, P., Barth, A. J., Bazhaw, C., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Cackett, E. M., Carini, M. T., Croxall, K. V., Crenshaw, D. M., Dalla Bonta, E., De Lorenzo-Caceres, A., Dietrich, M., Efimova, N. V., Ely, J., Evans, P. A., Filippenko, A. V., Flatland, K., Gehrels, N., Geier, S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Grier, C. J., Grupe, D., Hall, P. B., Hicks, S., Horenstein, D., Hutchison, T., Im, M., Jensen, J. J., Joner, M. D., Jones, J., Kaastra, J., Kaspi, S., Kelly, B. C., Kennea, J. A., Kim, S. C., Kim, M., Klimanov, S. A., Korista, K. T., Kriss, G. A., Lee, J. C., Leonard, D. C., Lira, P., MacInnis, F., Manne-Nicholas, E. R., Mathur, S., McHardy, I. M., Montouri, C., Musso, R., Nazarov, S. V., Norris, R. P., Nousek, J. A., Okhmat, D. N., Pancoast, A., Parks, J. R., Pei, L., Pogge, R. W., Pott, J-U, Rafter, S. E., Rix, H-W, Saylor, D. A., Schimoia, J. S., Schnuelle, K., Sergeev, S. G., Siegel, M. H., Spencer, M., Sung, H-I, Teems, K. G., Turner, C. S., Uttley, P., Vestergaard, M., Villforth, C., Weiss, Y., Woo, J-H, Yan, H., Young, S., Zheng, W., Zu, Y., Starkey, D., Horne, Keith, Fausnaugh, M. M., Peterson, B. M., Bentz, M. C., Kochanek, C. S., Denney, K. D., Edelson, R., Goad, M. R., De Rosa, G., Anderson, M. D., Arevalo, P., Barth, A. J., Bazhaw, C., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Cackett, E. M., Carini, M. T., Croxall, K. V., Crenshaw, D. M., Dalla Bonta, E., De Lorenzo-Caceres, A., Dietrich, M., Efimova, N. V., Ely, J., Evans, P. A., Filippenko, A. V., Flatland, K., Gehrels, N., Geier, S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Grier, C. J., Grupe, D., Hall, P. B., Hicks, S., Horenstein, D., Hutchison, T., Im, M., Jensen, J. J., Joner, M. D., Jones, J., Kaastra, J., Kaspi, S., Kelly, B. C., Kennea, J. A., Kim, S. C., Kim, M., Klimanov, S. A., Korista, K. T., Kriss, G. A., Lee, J. C., Leonard, D. C., Lira, P., MacInnis, F., Manne-Nicholas, E. R., Mathur, S., McHardy, I. M., Montouri, C., Musso, R., Nazarov, S. V., Norris, R. P., Nousek, J. A., Okhmat, D. N., Pancoast, A., Parks, J. R., Pei, L., Pogge, R. W., Pott, J-U, Rafter, S. E., Rix, H-W, Saylor, D. A., Schimoia, J. S., Schnuelle, K., Sergeev, S. G., Siegel, M. H., Spencer, M., Sung, H-I, Teems, K. G., Turner, C. S., Uttley, P., Vestergaard, M., Villforth, C., Weiss, Y., Woo, J-H, Yan, H., Young, S., Zheng, W., and Zu, Y.

Published
2017

30. A Multi-band Study of the Remarkable Jet in Quasar 4C+19.44

Author

Harris, D. E., primary, Lee, N. P., additional, Schwartz, D. A., additional, Siemiginowska, A., additional, Massaro, F., additional, Birkinshaw, M., additional, Worrall, D. M., additional, Cheung, C. C., additional, Gelbord, J. M., additional, Jorstad, Svetlana G., additional, Marscher, Alan P., additional, Landt, H., additional, Marshall, H., additional, Perlman, E. S., additional, Stawarz, L., additional, Uchiyama, Y., additional, and Urry, C. M., additional

Published
2017
Full Text
View/download PDF

31. Space Telescope and Optical Reverberation Mapping Project. VII. Understanding the Ultraviolet Anomaly in NGC 5548 with X-Ray Spectroscopy

Author

Mathur, S., primary, Gupta, A., additional, Page, K., additional, Pogge, R. W., additional, Krongold, Y., additional, Goad, M. R., additional, Adams, S. M., additional, Anderson, M. D., additional, Arévalo, P., additional, Barth, A. J., additional, Bazhaw, C., additional, Beatty, T. G., additional, Bentz, M. C., additional, Bigley, A., additional, Bisogni, S., additional, Borman, G. A., additional, Boroson, T. A., additional, Bottorff, M. C., additional, Brandt, W. N., additional, Breeveld, A. A., additional, Brown, J. E., additional, Brown, J. S., additional, Cackett, E. M., additional, Canalizo, G., additional, Carini, M. T., additional, Clubb, K. I., additional, Comerford, J. M., additional, Coker, C. T., additional, Corsini, E. M., additional, Crenshaw, D. M., additional, Croft, S., additional, Croxall, K. V., additional, Dalla Bontà, E., additional, Deason, A. J., additional, Denney, K. D., additional, De Lorenzo-Cáceres, A., additional, De Rosa, G., additional, Dietrich, M., additional, Edelson, R., additional, Ely, J., additional, Eracleous, M., additional, Evans, P. A., additional, Fausnaugh, M. M., additional, Ferland, G. J., additional, Filippenko, A. V., additional, Flatland, K., additional, Fox, O. D., additional, Gates, E. L., additional, Gehrels, N., additional, Geier, S., additional, Gelbord, J. M., additional, Gorjian, V., additional, Greene, J. E., additional, Grier, C. J., additional, Grupe, D., additional, Hall, P. B., additional, Henderson, C. B., additional, Hicks, S., additional, Holmbeck, E., additional, Holoien, T. W.-S., additional, Horenstein, D., additional, Horne, Keith, additional, Hutchison, T., additional, Im, M., additional, Jensen, J. J., additional, Johnson, C. A., additional, Joner, M. D., additional, Jones, J., additional, Kaastra, J., additional, Kaspi, S., additional, Kelly, B. C., additional, Kelly, P. L., additional, Kennea, J. A., additional, Kim, M., additional, Kim, S., additional, Kim, S. C., additional, King, A., additional, Klimanov, S. A., additional, Kochanek, C. S., additional, Korista, K. T., additional, Kriss, G. A., additional, Lau, M. W., additional, Lee, J. C., additional, Leonard, D. C., additional, Li, M., additional, Lira, P., additional, Ma, Z., additional, MacInnis, F., additional, Manne-Nicholas, E. R., additional, Malkan, M. A., additional, Mauerhan, J. C., additional, McGurk, R., additional, McHardy, I. M., additional, Montouri, C., additional, Morelli, L., additional, Mosquera, A., additional, Mudd, D., additional, Muller-Sanchez, F., additional, Musso, R., additional, Nazarov, S. V., additional, Netzer, H., additional, Nguyen, M. L., additional, Norris, R. P., additional, Nousek, J. A., additional, Ochner, P., additional, Okhmat, D. N., additional, Ou-Yang, B., additional, Pancoast, A., additional, Papadakis, I., additional, Parks, J. R., additional, Pei, L., additional, Peterson, B. M., additional, Pizzella, A., additional, Poleski, R., additional, Pott, J.-U., additional, Rafter, S. E., additional, Rix, H.-W., additional, Runnoe, J., additional, Saylor, D. A., additional, Schimoia, J. S., additional, Schnülle, K., additional, Sergeev, S. G., additional, Shappee, B. J., additional, Shivvers, I., additional, Siegel, M., additional, Simonian, G. V., additional, Siviero, A., additional, Skielboe, A., additional, Somers, G., additional, Spencer, M., additional, Starkey, D., additional, Stevens, D. J., additional, Sung, H.-I., additional, Tayar, J., additional, Tejos, N., additional, Turner, C. S., additional, Uttley, P., additional, Van Saders, J., additional, Vestergaard, M., additional, Vican, L., additional, Villanueva Jr., S., additional, Villforth, C., additional, Weiss, Y., additional, Woo, J.-H., additional, Yan, H., additional, Young, S., additional, Yuk, H., additional, Zheng, W., additional, Zhu, W., additional, and Zu, Y., additional

Published
2017
Full Text
View/download PDF

32. Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-line Analysis for NGC 5548

Author

Pei, L., primary, Fausnaugh, M. M., additional, Barth, A. J., additional, Peterson, B. M., additional, Bentz, M. C., additional, De Rosa, G., additional, Denney, K. D., additional, Goad, M. R., additional, Kochanek, C. S., additional, Korista, K. T., additional, Kriss, G. A., additional, Pogge, R. W., additional, Bennert, V. N., additional, Brotherton, M., additional, Clubb, K. I., additional, Dalla Bontà, E., additional, Filippenko, A. V., additional, Greene, J. E., additional, Grier, C. J., additional, Vestergaard, M., additional, Zheng, W., additional, Adams, Scott M., additional, Beatty, Thomas G., additional, Bigley, A., additional, Brown, Jacob E., additional, Brown, Jonathan S., additional, Canalizo, G., additional, Comerford, J. M., additional, Coker, Carl T., additional, Corsini, E. M., additional, Croft, S., additional, Croxall, K. V., additional, Deason, A. J., additional, Eracleous, Michael, additional, Fox, O. D., additional, Gates, E. L., additional, Henderson, C. B., additional, Holmbeck, E., additional, Holoien, T. W.-S., additional, Jensen, J. J., additional, Johnson, C. A., additional, Kelly, P. L., additional, Kim, S., additional, King, A., additional, Lau, M. W., additional, Li, Miao, additional, Lochhaas, Cassandra, additional, Ma, Zhiyuan, additional, Manne-Nicholas, E. R., additional, Mauerhan, J. C., additional, Malkan, M. A., additional, McGurk, R., additional, Morelli, L., additional, Mosquera, Ana, additional, Mudd, Dale, additional, Sanchez, F. Muller, additional, Nguyen, M. L., additional, Ochner, P., additional, Ou-Yang, B., additional, Pancoast, A., additional, Penny, Matthew T., additional, Pizzella, A., additional, Poleski, Radosław, additional, Runnoe, Jessie, additional, Scott, B., additional, Schimoia, Jaderson S., additional, Shappee, B. J., additional, Shivvers, I., additional, Simonian, Gregory V., additional, Siviero, A., additional, Somers, Garrett, additional, Stevens, Daniel J., additional, Strauss, M. A., additional, Tayar, Jamie, additional, Tejos, N., additional, Treu, T., additional, Van Saders, J., additional, Vican, L., additional, Villanueva, S., additional, Yuk, H., additional, Zakamska, N. L., additional, Zhu, W., additional, Anderson, M. D., additional, Arévalo, P., additional, Bazhaw, C., additional, Bisogni, S., additional, Borman, G. A., additional, Bottorff, M. C., additional, Brandt, W. N., additional, Breeveld, A. A., additional, Cackett, E. M., additional, Carini, M. T., additional, Crenshaw, D. M., additional, De Lorenzo-Cáceres, A., additional, Dietrich, M., additional, Edelson, R., additional, Efimova, N. V., additional, Ely, J., additional, Evans, P. A., additional, Ferland, G. J., additional, Flatland, K., additional, Gehrels, N., additional, Geier, S., additional, Gelbord, J. M., additional, Grupe, D., additional, Gupta, A., additional, Hall, P. B., additional, Hicks, S., additional, Horenstein, D., additional, Horne, Keith, additional, Hutchison, T., additional, Im, M., additional, Joner, M. D., additional, Jones, J., additional, Kaastra, J., additional, Kaspi, S., additional, Kelly, B. C., additional, Kennea, J. A., additional, Kim, M., additional, Kim, S. C., additional, Klimanov, S. A., additional, Lee, J. C., additional, Leonard, D. C., additional, Lira, P., additional, MacInnis, F., additional, Mathur, S., additional, McHardy, I. M., additional, Montouri, C., additional, Musso, R., additional, Nazarov, S. V., additional, Netzer, H., additional, Norris, R. P., additional, Nousek, J. A., additional, Okhmat, D. N., additional, Papadakis, I., additional, Parks, J. R., additional, Pott, J.-U., additional, Rafter, S. E., additional, Rix, H.-W., additional, Saylor, D. A., additional, Schnülle, K., additional, Sergeev, S. G., additional, Siegel, M., additional, Skielboe, A., additional, Spencer, M., additional, Starkey, D., additional, Sung, H.-I., additional, Teems, K. G., additional, Turner, C. S., additional, Uttley, P., additional, Villforth, C., additional, Weiss, Y., additional, Woo, J.-H., additional, Yan, H., additional, Young, S., additional, and Zu, Y., additional

Published
2017
Full Text
View/download PDF

33. SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT.VI. REVERBERATING DISK MODELS FOR NGC 5548

Author

Starkey, D., primary, Horne, Keith, additional, Fausnaugh, M. M., additional, Peterson, B. M., additional, Bentz, M. C., additional, Kochanek, C. S., additional, Denney, K. D., additional, Edelson, R., additional, Goad, M. R., additional, Rosa, G. De, additional, Anderson, M. D., additional, Arévalo, P., additional, Barth, A. J., additional, Bazhaw, C., additional, Borman, G. A., additional, Boroson, T. A., additional, Bottorff, M. C., additional, Brandt, W. N., additional, Breeveld, A. A., additional, Cackett, E. M., additional, Carini, M. T., additional, Croxall, K. V., additional, Crenshaw, D. M., additional, Bontà, E. Dalla, additional, Lorenzo-Cáceres, A. De, additional, Dietrich, M., additional, Efimova, N. V., additional, Ely, J., additional, Evans, P. A., additional, Filippenko, A. V., additional, Flatland, K., additional, Gehrels, N., additional, Geier, S., additional, Gelbord, J. M., additional, Gonzalez, L., additional, Gorjian, V., additional, Grier, C. J., additional, Grupe, D., additional, Hall, P. B., additional, Hicks, S., additional, Horenstein, D., additional, Hutchison, T., additional, Im, M., additional, Jensen, J. J., additional, Joner, M. D., additional, Jones, J., additional, Kaastra, J., additional, Kaspi, S., additional, Kelly, B. C., additional, Kennea, J. A., additional, Kim, S. C., additional, Kim, M., additional, Klimanov, S. A., additional, Korista, K. T., additional, Kriss, G. A., additional, Lee, J. C., additional, Leonard, D. C., additional, Lira, P., additional, MacInnis, F., additional, Manne-Nicholas, E. R., additional, Mathur, S., additional, McHardy, I. M., additional, Montouri, C., additional, Musso, R., additional, Nazarov, S. V., additional, Norris, R. P., additional, Nousek, J. A., additional, Okhmat, D. N., additional, Pancoast, A., additional, Parks, J. R., additional, Pei, L., additional, Pogge, R. W., additional, Pott, J.-U., additional, Rafter, S. E., additional, Rix, H.-W., additional, Saylor, D. A., additional, Schimoia, J. S., additional, Schnülle, K., additional, Sergeev, S. G., additional, Siegel, M. H., additional, Spencer, M., additional, Sung, H.-I., additional, Teems, K. G., additional, Turner, C. S., additional, Uttley, P., additional, Vestergaard, M., additional, Villforth, C., additional, Weiss, Y., additional, Woo, J.-H., additional, Yan, H., additional, Young, and S., additional, Zheng, W., additional, and Zu, Y., additional

Published
2017
Full Text
View/download PDF

34. Space Telescope and Optical Reverberation Mapping Project. IV. Anomalous Behavior of the Broad Ultraviolet Emission Lines in NGC 5548

Author

Goad, M. R., Korista, K. T., De Rosa, G., Kriss, G. A., Edelson, R., Barth, A. J., Ferland, G. J., Kochanek, C. S., Peterson, B. M., Denney, K. D., Pei, L., Skielboe, A., Starkey, D., Vestergaard, M., Zu, Y., Anderson, M. D., Arevalo, P., Borman, G. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Brewer, B. J., Cackett, E. M., Carini, M. T., Croxall, K. V., Dalla Bonta, E., De Lorenzo-Caceres, A., Efimova, N. V., Filippenko, A. V., Gelbord, J. M., Hutchison, T., Im, M., Jensen, J. J., Joner, M. D., Goad, M. R., Korista, K. T., De Rosa, G., Kriss, G. A., Edelson, R., Barth, A. J., Ferland, G. J., Kochanek, C. S., Peterson, B. M., Denney, K. D., Pei, L., Skielboe, A., Starkey, D., Vestergaard, M., Zu, Y., Anderson, M. D., Arevalo, P., Borman, G. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Brewer, B. J., Cackett, E. M., Carini, M. T., Croxall, K. V., Dalla Bonta, E., De Lorenzo-Caceres, A., Efimova, N. V., Filippenko, A. V., Gelbord, J. M., Hutchison, T., Im, M., Jensen, J. J., and Joner, M. D.

Published
2016

35. SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. IV. ANOMALOUS BEHAVIOR OF THE BROAD ULTRAVIOLET EMISSION LINES IN NGC 5548

Author

Goad, M. R., primary, Korista, K. T., additional, Rosa, G. De, additional, Kriss, G. A., additional, Edelson, R., additional, Barth, A. J., additional, Ferland, G. J., additional, Kochanek, C. S., additional, Netzer, H., additional, Peterson, B. M., additional, Bentz, M. C., additional, Bisogni, S., additional, Crenshaw, D. M., additional, Denney, K. D., additional, Ely, J., additional, Fausnaugh, M. M., additional, Grier, C. J., additional, Gupta, A., additional, Horne, K. D., additional, Kaastra, J., additional, Pancoast, A., additional, Pei, L., additional, Pogge, R. W., additional, Skielboe, A., additional, Starkey, D., additional, Vestergaard, M., additional, Zu, Y., additional, Anderson, M. D., additional, Arévalo, P., additional, Bazhaw, C., additional, Borman, G. A., additional, Boroson, T. A., additional, Bottorff, M. C., additional, Brandt, W. N., additional, Breeveld, A. A., additional, Brewer, B. J., additional, Cackett, E. M., additional, Carini, M. T., additional, Croxall, K. V., additional, Bontà, E. Dalla, additional, Lorenzo-Cáceres, A. De, additional, Dietrich, M., additional, Efimova, N. V., additional, Evans, P. A., additional, Filippenko, A. V., additional, Flatland, K., additional, Gehrels, N., additional, Geier, S., additional, Gelbord, J. M., additional, Gonzalez, L., additional, Gorjian, V., additional, Grupe, D., additional, Hall, P. B., additional, Hicks, S., additional, Horenstein, D., additional, Hutchison, T., additional, Im, M., additional, Jensen, J. J., additional, Joner, M. D., additional, Jones, J., additional, Kaspi, S., additional, Kelly, B. C., additional, Kennea, J. A., additional, Kim, M., additional, Kim, S. C., additional, Klimanov, S. A., additional, Lee, J. C., additional, Leonard, D. C., additional, Lira, P., additional, MacInnis, F., additional, Manne-Nicholas, E. R., additional, Mathur, S., additional, McHardy, I. M., additional, Montouri, C., additional, Musso, R., additional, Nazarov, S. V., additional, Norris, R. P., additional, Nousek, J. A., additional, Okhmat, D. N., additional, Papadakis, I., additional, Parks, J. R., additional, Pott, J.-U., additional, Rafter, S. E., additional, Rix, H.-W., additional, Saylor, D. A., additional, Schimoia, J. S., additional, Schnülle, K., additional, Sergeev, S. G., additional, Siegel, M., additional, Spencer, M., additional, Sung, H.-I., additional, Teems, K. G., additional, Treu, T., additional, Turner, C. S., additional, Uttley, P., additional, Villforth, C., additional, Weiss, Y., additional, Woo, J.-H., additional, Yan, H., additional, Young, S., additional, and Zheng, W.-K., additional

Published
2016
Full Text
View/download PDF

36. SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION AND BROADBAND TIME DELAYS IN NGC 5548

Author

Fausnaugh, M. M., primary, Denney, K. D., additional, Barth, A. J., additional, Bentz, M. C., additional, Bottorff, M. C., additional, Carini, M. T., additional, Croxall, K. V., additional, Rosa, G. De, additional, Goad, M. R., additional, Horne, Keith, additional, Joner, M. D., additional, Kaspi, S., additional, Kim, M., additional, Klimanov, S. A., additional, Kochanek, C. S., additional, Leonard, D. C., additional, Netzer, H., additional, Peterson, B. M., additional, Schnülle, K., additional, Sergeev, S. G., additional, Vestergaard, M., additional, Zheng, W.-K., additional, Zu, Y., additional, Anderson, M. D., additional, Arévalo, P., additional, Bazhaw, C., additional, Borman, G. A., additional, Boroson, T. A., additional, Brandt, W. N., additional, Breeveld, A. A., additional, Brewer, B. J., additional, Cackett, E. M., additional, Crenshaw, D. M., additional, Bontà, E. Dalla, additional, Lorenzo-Cáceres, A. De, additional, Dietrich, M., additional, Edelson, R., additional, Efimova, N. V., additional, Ely, J., additional, Evans, P. A., additional, Filippenko, A. V., additional, Flatland, K., additional, Gehrels, N., additional, Geier, S., additional, Gelbord, J. M., additional, Gonzalez, L., additional, Gorjian, V., additional, Grier, C. J., additional, Grupe, D., additional, Hall, P. B., additional, Hicks, S., additional, Horenstein, D., additional, Hutchison, T., additional, Im, M., additional, Jensen, J. J., additional, Jones, J., additional, Kaastra, J., additional, Kelly, B. C., additional, Kennea, J. A., additional, Kim, S. C., additional, Korista, K. T., additional, Kriss, G. A., additional, Lee, J. C., additional, Lira, P., additional, MacInnis, F., additional, Manne-Nicholas, E. R., additional, Mathur, S., additional, McHardy, I. M., additional, Montouri, C., additional, Musso, R., additional, Nazarov, S. V., additional, Norris, R. P., additional, Nousek, J. A., additional, Okhmat, D. N., additional, Pancoast, A., additional, Papadakis, I., additional, Parks, J. R., additional, Pei, L., additional, Pogge, R. W., additional, Pott, J.-U., additional, Rafter, S. E., additional, Rix, H.-W., additional, Saylor, D. A., additional, Schimoia, J. S., additional, Siegel, M., additional, Spencer, M., additional, Starkey, D., additional, Sung, H.-I., additional, Teems, K. G., additional, Treu, T., additional, Turner, C. S., additional, Uttley, P., additional, Villforth, C., additional, Weiss, Y., additional, Woo, J.-H., additional, Yan, H., additional, and Young, S., additional

Published
2016
Full Text
View/download PDF

37. SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. II.SWIFTANDHSTREVERBERATION MAPPING OF THE ACCRETION DISK OF NGC 5548

Author

Edelson, R., primary, Gelbord, J. M., additional, Horne, K., additional, McHardy, I. M., additional, Peterson, B. M., additional, Arévalo, P., additional, Breeveld, A. A., additional, Rosa, G. De, additional, Evans, P. A., additional, Goad, M. R., additional, Kriss, G. A., additional, Brandt, W. N., additional, Gehrels, N., additional, Grupe, D., additional, Kennea, J. A., additional, Kochanek, C. S., additional, Nousek, J. A., additional, Papadakis, I., additional, Siegel, M., additional, Starkey, D., additional, Uttley, P., additional, Vaughan, S., additional, Young, S., additional, Barth, A. J., additional, Bentz, M. C., additional, Brewer, B. J., additional, Crenshaw, D. M., additional, Dalla Bontà, E., additional, Cáceres, A. De Lorenzo-, additional, Denney, K. D., additional, Dietrich, M., additional, Ely, J., additional, Fausnaugh, M. M., additional, Grier, C. J., additional, Hall, P. B., additional, Kaastra, J., additional, Kelly, B. C., additional, Korista, K. T., additional, Lira, P., additional, Mathur, S., additional, Netzer, H., additional, Pancoast, A., additional, Pei, L., additional, Pogge, R. W., additional, Schimoia, J. S., additional, Treu, T., additional, Vestergaard, M., additional, Villforth, C., additional, Yan, H., additional, and Zu, Y., additional

Published
2015
Full Text
View/download PDF

38. SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. I. ULTRAVIOLET OBSERVATIONS OF THE SEYFERT 1 GALAXY NGC 5548 WITH THE COSMIC ORIGINS SPECTROGRAPH ONHUBBLE SPACE TELESCOPE

Author

Rosa, G. De, primary, Peterson, B. M., additional, Ely, J., additional, Kriss, G. A., additional, Crenshaw, D. M., additional, Horne, Keith, additional, Korista, K. T., additional, Netzer, H., additional, Pogge, R. W., additional, Arévalo, P., additional, Barth, A. J., additional, Bentz, M. C., additional, Brandt, W. N., additional, Breeveld, A. A., additional, Brewer, B. J., additional, Dalla Bontà, E., additional, Lorenzo-Cáceres, A. De, additional, Denney, K. D., additional, Dietrich, M., additional, Edelson, R., additional, Evans, P. A., additional, Fausnaugh, M. M., additional, Gehrels, N., additional, Gelbord, J. M., additional, Goad, M. R., additional, Grier, C. J., additional, Grupe, D., additional, Hall, P. B., additional, Kaastra, J., additional, Kelly, B. C., additional, Kennea, J. A., additional, Kochanek, C. S., additional, Lira, P., additional, Mathur, S., additional, McHardy, I. M., additional, Nousek, J. A., additional, Pancoast, A., additional, Papadakis, I., additional, Pei, L., additional, Schimoia, J. S., additional, Siegel, M., additional, Starkey, D., additional, Treu, T., additional, Uttley, P., additional, Vaughan, S., additional, Vestergaard, M., additional, Villforth, C., additional, Yan, H., additional, Young, S., additional, and Zu, Y., additional

Published
2015
Full Text
View/download PDF

39. Swift follow-up of IceCube triggers, and implications for the Advanced-LIGO era

Author

Evans, P. A., primary, Osborne, J. P., additional, Kennea, J. A., additional, Smith, M., additional, Palmer, D. M., additional, Gehrels, N., additional, Gelbord, J. M., additional, Homeier, A., additional, Voge, M., additional, Strotjohann, N. L., additional, Cowen, D. F., additional, Böser, S., additional, Kowalski, M., additional, and Stasik, A., additional

Published
2015
Full Text
View/download PDF

40. Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

Author

Andrew J. King, K. G. Teems, Gabriele Ponti, J. S. Schimoia, Calen B. Henderson, Michael S. Brotherton, S. Paltani, Nahum Arav, Alessandro Siviero, Radosław Poleski, P. Lira, Sang Chul Kim, Thomas W.-S. Holoien, Wei Zhu, A. de Lorenzo-Cáceres, M. C. Bottorff, Dirk Grupe, Gabriela Canalizo, M. Eracleous, S. G. Sergeev, F. MacInnis, Massimo Cappi, M. Dietrich, Alis J. Deason, Haojing Yan, Giorgio Matt, Ciro Pinto, Michael T. Carini, Minjin Kim, Brandon C. Kelly, I. M. McHardy, Scott M. Adams, L. Gonzalez, J. J. Jensen, Julia M. Comerford, Yair Krongold, Tim Waters, B. Scott, C. S. Turner, G. A. Borman, R. McGurk, Nicolas Tejos, J. R. Parks, K. Flatland, Michael D. Joner, Kirk T. Korista, L. Di Gesu, Emma Gardner, Jon C. Mauerhan, Jessie C. Runnoe, Douglas C. Leonard, Kelsey I. Clubb, M. H. Siegel, C. A. Johnson, D. A. Starkey, H. Yuk, M. A. Malkan, Justin Ely, Ying Zu, Aaron J. Barth, Cassandra Lochhaas, Patrick L. Kelly, E. Holmbeck, Hyun-Il Sung, Patrick B. Hall, C. Montuori, Christopher S. Kochanek, Bradley M. Peterson, Tommaso Treu, Missagh Mehdipour, Marie Wingyee Lau, A. Skielboe, Catherine J. Grier, J. A. Kennea, Thomas G. Beatty, R. W. Pogge, J. van Saders, A. Bigley, S. Hicks, Catia Silva, H. W. Rix, Vardha N. Bennert, D. M. Crenshaw, E. Dalla Bontà, Miao Li, A. A. Breeveld, Dom Walton, D. N. Okhmat, Elisa Costantini, P. Ochner, Y. Weiss, M. L. Nguyen, Ryan Norris, Susanna Bisogni, Ehud Behar, Jacobo Ebrero, Garrett Somers, Phil Uttley, S. Rafter, Kelly D. Denney, K. Schnülle, Carolin Villforth, Keith Horne, Smita Mathur, G. V. Simonian, R. Boissay-Malaquin, Gary J. Ferland, J. S. Brown, Jelle Kaastra, Ana M. Mosquera, Stefano Bianchi, Misty C. Bentz, A. Pancoast, Alessandro Pizzella, WeiKang Zheng, N. Gehrels, Daniel J. Stevens, M. Dehghanian, Kevin V. Croxall, Isaac Shivvers, A. Gupta, Chris Done, J. E. Brown, B. De Marco, Gerard A. Kriss, Steve Croft, S. V. Nazarov, J. A. Nousek, Jae-Ok Lee, P. Arévalo, G. De Rosa, Michael Fausnaugh, Rick Edelson, Phil Evans, Lorenzo Morelli, S. Geier, Enrico Maria Corsini, M. R. Goad, V. Gorjian, W. N. Brandt, Elinor L. Gates, Shai Kaspi, D. A. Saylor, Jong-Hak Woo, Edward M. Cackett, Liuyi Pei, T. Hutchison, Jamie Tayar, E. R. Manne-Nicholas, Laura Vican, Daniel Proga, Steven Villanueva, D. Mudd, J.-U. Pott, F. Müller-Sánchez, Alexei V. Filippenko, Hagai Netzer, S. A. Klimanov, B. J. Shappee, J. M. Gelbord, Marianne Vestergaard, M. Spencer, Zhiyuan Ma, Carl T. Coker, S. Y. Kim, Myungshin Im, Science & Technology Facilities Council, University of St Andrews. School of Physics and Astronomy, University of St Andrews. St Andrews Centre for Exoplanet Science, High Energy Astrophys. & Astropart. Phys (API, FNWI), Kriss, G. A., De Rosa, G., Ely, J., Peterson, B. M., Kaastra, J., Mehdipour, M., Ferland, G. J., Dehghanian, M., Mathur, S., Edelson, R., Korista, K. T., Arav, N., Barth, A. J., Bentz, M. C., Brandt, W. N., Crenshaw, D. M., Bontà, E. Dalla, Denney, K. D., Done, C., Eracleous, M., Fausnaugh, M. M., Gardner, E., Goad, M. R., Grier, C. J., Horne, Keith, Kochanek, C. S., Mchardy, I. M., Netzer, H., Pancoast, A., Pei, L., Pogge, R. W., Proga, D., Silva, C., Tejos, N., Vestergaard, M., Adams, S. M., Anderson, M. D., Arévalo, P., Beatty, T G., Behar, E., Bennert, V. N., Bianchi, S., Bigley, A., Bisogni, S., Boissay-Malaquin, R., Borman, G. A., Bottorff, M. C., Breeveld, A. A., Brotherton, M., Brown, J. E., Brown, J. S., Cackett, E. M., Canalizo, G., Cappi, M., Carini, M. T., Clubb, K. I., Comerford, J. M., Coker, C. T., Corsini, E. M., Costantini, E., Croft, S., Croxall, K. V., Deason, A. J., De Lorenzo-Cáceres, A., De Marco, B., Dietrich, M., Di Gesu, L., Ebrero, J., Evans, P. A., Filippenko, A. V., Flatland, K., Gates, E. L., Gehrels, N., Geier, S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Grupe, D., Gupta, A., Hall, P. B., Henderson, C. B., Hicks, S., Holmbeck, E., Holoien, T. W. -S., Hutchison, T. A., Im, M., Jensen, J. J., Johnson, C. A., Joner, M. D., Kaspi, S., Kelly, B. C., Kelly, P. L., Kennea, J. A., Kim, M., Kim, S. C., Kim, S. Y., King, A., Klimanov, S. A., Krongold, Y., Lau, M. W., Lee, J. C., Leonard, D. C., Li, Miao, Lira, P., Lochhaas, C., Ma, Zhiyuan, Macinnis, F., Malkan, M. A., Manne-Nicholas, E. R., Matt, G., Mauerhan, J. C., Mcgurk, R., Montuori, C., Morelli, L., Mosquera, A., Mudd, D., Müller-Sánchez, F., Nazarov, S. V., Norris, R. P., Nousek, J. A., Nguyen, M. L., Ochner, P., Okhmat, D. N., Paltani, S., Parks, J. R., Pinto, C., Pizzella, A., Poleski, R., Ponti, G., Pott, J. -U., Rafter, S. E., Rix, H. -W., Runnoe, J., Saylor, D. A., Schimoia, J. S., Schnülle, K., Scott, B., Sergeev, S. G., Shappee, B. J., Shivvers, I., Siegel, M., Simonian, G. V., Siviero, A., Skielboe, A., Somers, G., Spencer, M., Starkey, D., Stevens, D. J., Sung, H. -I., Tayar, J., Teems, K. G., Treu, T., Turner, C. S., Uttley, P., Van Saders, J ., Vican, L., Villforth, C., Villanueva Jr., S., Walton, D. J., Waters, T., Weiss, Y., Woo, J. -H., Yan, H., Yuk, H., Zheng, W., Zhu, W., Zu, Y., and USA

Subjects
Seyfert [Galaxies], galaxies: active, galaxies: individual (NGC 5548), galaxies: nuclei, galaxies: Seyfert, 010504 meteorology & atmospheric sciences, Absorption spectroscopy, active [Galaxies], individual (NGC 5548) [Galaxies], Astrophysics::High Energy Astrophysical Phenomena, Continuum (design consultancy), FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Spectral line, Luminosity, 0103 physical sciences, QB Astronomy, Emission spectrum, Absorption (electromagnetic radiation), 010303 astronomy & astrophysics, QC, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, QB, Physics, Astronomy and Astrophysics, DAS, Astrophysics - Astrophysics of Galaxies, Galaxy, QC Physics, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), nuclei [Galaxies], Reverberation mapping
Abstract

We model the ultraviolet spectra of the Seyfert 1 galaxy NGC~5548 obtained with the Hubble Space Telescope during the 6-month reverberation-mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblends the individual emission lines. Using the modeled spectra, we measure the response to continuum variations for the deblended and absorption-corrected individual broad emission lines, the velocity-dependent profiles of Ly$\alpha$ and C IV, and the narrow and broad intrinsic absorption features. We find that the time lags for the corrected emission lines are comparable to those for the original data. The velocity-binned lag profiles of Ly$\alpha$ and C IV have a double-peaked structure indicative of a truncated Keplerian disk. The narrow absorption lines show delayed response to continuum variations corresponding to recombination in gas with a density of $\sim 10^5~\rm cm^{-3}$. The high-ionization narrow absorption lines decorrelate from continuum variations during the same period as the broad emission lines. Analyzing the response of these absorption lines during this period shows that the ionizing flux is diminished in strength relative to the far-ultraviolet continuum. The broad absorption lines associated with the X-ray obscurer decrease in strength during this same time interval. The appearance of X-ray obscuration in $\sim\,2012$ corresponds with an increase in the luminosity of NGC 5548 following an extended low state. We suggest that the obscurer is a disk wind triggered by the brightening of NGC 5548 following the decrease in size of the broad-line region during the preceding low-luminosity state., Comment: 50 pages, 30 figures, uses aastex62.cls. Accepted for publication in ApJ, 07/06/2019. High-level products page in MAST will go live after 7/15/2019. Replaced Figure 4 on 7/12/2019 to be more red/green color-blind friendly

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results