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

Author

B. J. Shappee, J. M. Gelbord, Alessandro Siviero, Marianne Vestergaard, M. Spencer, G. A. Borman, Kevin V. Croxall, Michael Fausnaugh, Rick Edelson, M. C. Bottorff, Yair Krongold, Jeremy Jones, A. Skielboe, Nicolas Tejos, T. Hutchison, F. MacInnis, J. E. Brown, Catherine J. Grier, Hyun-Il Sung, M. L. Nguyen, Ryan Norris, Alis J. Deason, Haojing Yan, Susanna Bisogni, D. M. Crenshaw, J. A. Kennea, Alexei V. Filippenko, P. Ochner, S. V. Nazarov, A. A. Breeveld, Keith Horne, I. M. McHardy, Y. Weiss, E. Holmbeck, Wei Zhu, Michael T. Carini, J. A. Nousek, Hagai Netzer, A. Bigley, S. Hicks, Michael D. Joner, Kirk T. Korista, S. A. Klimanov, S. C. Kim, G. De Rosa, Jon C. Mauerhan, E. R. Manne-Nicholas, J. van Saders, Isaac Shivvers, Aaron J. Barth, Christopher S. Kochanek, Vardha N. Bennert, Ying Zu, Sang Chul Kim, Kelly D. Denney, Scott M. Adams, S. G. Sergeev, L. Gonzalez, F. Müller Sánchez, H. Yuk, Steven Villanueva, N. Gehrels, J. J. Jensen, R. McGurk, M. Im, Miao Li, K. Flatland, Garrett Somers, Jamie Tayar, D. Mudd, S. Geier, Enrico Maria Corsini, Phil Uttley, S. Rafter, M. Eracleous, H. W. Rix, Lorenzo Morelli, Douglas C. Leonard, Kelsey I. Clubb, Laura Vican, K. Schnülle, Smita Mathur, C. S. Turner, J. R. Parks, J.-U. Pott, M. Dietrich, Patrick L. Kelly, Jenny E. Greene, Carolin Villforth, P. Arévalo, Calen B. Henderson, Michael S. Brotherton, A. Gupta, M. W. Lau, Julia M. Comerford, Chris Done, Minjin Kim, Ori D. Fox, Gerard A. Kriss, Gary J. Ferland, Daniel Proga, S. Young, N. V. Efimova, Thomas W.-S. Holoien, P. A. Evans, Radosław Poleski, M. R. Goad, Dirk Grupe, B. Scott, Alessandro Pizzella, Zhiyuan Ma, J. S. Schimoia, J. C. Lee, Jong-Hak Woo, P. Lira, Cassandra Lochhaas, Jessie C. Runnoe, M. H. Siegel, Justin Ely, Patrick B. Hall, I. E. Papadakis, C. A. Johnson, Tommaso Treu, Emma Gardner, Todd Boroson, D. A. Starkey, Daniel J. Stevens, Thomas G. Beatty, Andrew J. King, Jelle Kaastra, Edward M. Cackett, Misty C. Bentz, J. S. Brown, Liuyi Pei, D. N. Okhmat, Steve Croft, M. A. Malkan, G. V. Simonian, M. Dehghanian, C. Montuori, Bradley M. Peterson, E. Dalla Bontà, R. W. Pogge, Matthew T. Penny, V. Gorjian, W. N. Brandt, Elinor L. Gates, Shai Kaspi, D. A. Saylor, Ana M. Mosquera, A. Pancoast, WeiKang Zheng, A. de Lorenzo-Cáceres, Gabriela Canalizo, ITA, USA, GBR, Science & Technology Facilities Council, University of St Andrews. School of Physics and Astronomy, and University of St Andrews. St Andrews Centre for Exoplanet Science

Subjects
Seyfert [Galaxies], Active galactic nucleus, active [Galaxies], 010504 meteorology & atmospheric sciences, individual (NGC 5548) [Galaxies], Active galaxies, Astrophysical black holes, Supermassive black holes, Active galactic nuclei, Reverberation mapping, astro-ph.GA, T-NDAS, FOS: Physical sciences, Astrophysics, Astronomy & Astrophysics, 01 natural sciences, Atomic, Physical Chemistry, Virial theorem, Reverberation mapping, Particle and Plasma Physics, Spitzer Space Telescope, Supermassive black holes, 0103 physical sciences, QB Astronomy, Nuclear, Emission spectrum, 010303 astronomy & astrophysics, QC, QB, 0105 earth and related environmental sciences, Line (formation), Physics, Active galactic nuclei, Supermassive black hole, Astrophysical black holes, Molecular, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Black hole, QC Physics, Space and Planetary Science, nuclei [Galaxies], Astrophysics of Galaxies (astro-ph.GA), Active galaxies, Astronomical and Space Sciences, Physical Chemistry (incl. Structural)
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., 19 pages, 9 figures, ApJ in press

Published
2021

2. 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
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3. Reverberation Mapping Results for Five Seyfert 1 Galaxies

Author

Takeo Minezaki, S. V. Nazarov, Chien-Ting J. Chen, Paul Martini, Misty C. Bentz, Ondřej Pejcha, Benjamin J. Shappee, Ying Zu, Kelly D. Denney, N. Free, Joseph C. Shields, K. Z. Stanek, D. N. Okhmat, Jan Skowron, Robert J. Siverd, Ashley L. King, Xiao Che, C. Araya Salvo, Calen B. Henderson, Monica Valluri, S. Rafter, Yu. S. Efimov, Jonathan C. Bird, D. M. Szczygiel, M. Dietrich, Shintaro Koshida, Shai Kaspi, Thomas G. Beatty, I. Ginsburg, Mallory Molina, S. G. Sergeev, Ana M. Mosquera, Bradley M. Peterson, Richard W. Pogge, D. J. Bord, K. Mogren, Christopher S. Kochanek, T. Drake, J. van Saders, V. T. Doroshenko, Catherine J. Grier, S. A. Cohen, and G. A. Borman

Subjects
Physics, Supermassive black hole, Active galactic nucleus, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, FOS: Physical sciences, Astronomy and Astrophysics, Photoionization, Astrophysics, Light curve, 01 natural sciences, Galaxy, Space and Planetary Science, 0103 physical sciences, Reverberation mapping, Angstrom, Emission spectrum, 010303 astronomy & astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present the results from a detailed analysis of photometric and spectrophotometric data on five Seyfert 1 galaxies observed as a part of a recent reverberation mapping program. The data were collected at several observatories over a 140-day span beginning in 2010 August and ending in 2011 January. We obtained high sampling-rate light curves for Mrk 335, Mrk 1501, 3C120, Mrk 6, and PG2130+099, from which we have measured the time lag between variations in the 5100 Angstrom continuum and the H-beta broad emission line. We then used these measurements to calculate the mass of the supermassive black hole at the center of each of these galaxies. Our new measurements substantially improve previous measurements of MBH and the size of the broad line-emitting region for four sources and add a measurement for one new object. Our new measurements are consistent with photoionization physics regulating the location of the broad line region in active galactic nuclei., 45 pages, 5 figures. Accepted for publication in ApJ. For a brief video explaining the key results of this paper, see http://www.youtube.com/user/OSUAstronomy

Published
2012

4. A Multi-Wavelength Study of the Nature of Type 1.8/1.9 Seyfert Galaxies

Author

Rajesh P. Deo, S. Rafter, Steven B. Kraemer, T. J. Turner, M. Dietrich, Margaret Trippe, and D. M. Crenshaw

Subjects
Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Line-of-sight, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Torus, Multi wavelength, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Type (model theory), Continuum flux, Galaxy, Spectral line, Space and Planetary Science, Emission spectrum, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We focus on determining the underlying physical cause of a Seyfert galaxy's appearance as type a 1.8 or 1.9. Are these "intermediate" Seyfert types typical Seyfert 1 nuclei with reddened broad-line regions? Or are they objects with intrinsically weak continua and broad emission lines? We compare measurements of the optical reddening of the narrow and broad-line regions with each other and with the X-ray column derived from XMM-Newton 0.5-10 keV spectra to determine the presence and location of dust in the line of sight. We also searched the literature to see if the objects showed evidence for broad-line variability, and determined if the changes were consistent with a change in reddening or a change in the intrinsic ionizing continuum flux. We find that 10 of 19 objects previously classified as Seyfert 1.8/1.9s received this designation due to their low continuum flux. In four objects the classification was due to BLR reddening, either by the torus or dust structures in the vicinity of the NLR; in the remaining five objects there is not sufficient evidence to favor one scenario over the other. These findings imply that, in general, samples of 1.8/1.9s are not suitable for use in studies of the gas and dust in the central torus., 85 pages, accepted by ApJ

Published
2010

5. A TENTATIVE SIZE-LUMINOSITY RELATION FOR THE IRON EMISSION-LINE REGION IN QUASARS

Author

Doron Chelouche, Shai Kaspi, S. Rafter, Aaron J. Barth, and Gabriel I. Cotlier

Subjects
Physics, 010504 meteorology & atmospheric sciences, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Quasar, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Astrophysics - Astrophysics of Galaxies, 01 natural sciences, Luminosity, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Reverberation mapping, Emission spectrum, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Line (formation)
Abstract

New reverberation mapping measurements of the size of the optical iron emission-line region in quasars are provided, and a tentative size-luminosity relation for this component is reported. Combined with lag measurements in low-luminosity sources, the results imply an emission-region size that is comparable to and at most twice that of the H$\beta$ line, and is characterized by a similar luminosity dependence. This suggests that the physics underlying the formation of the optical iron blends in quasars may be similar to that of other broad emission lines., Comment: 5 pages, 3 figures, ApJL published

Published
2014
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6. THE STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI. I. RECONSTRUCTED VELOCITY-DELAY MAPS

Author

D. N. Okhmat, Yu. S. Efimov, G. De Rosa, Misty C. Bentz, Mallory Molina, Ondřej Pejcha, Catherine J. Grier, B. J. Shappee, R. W. Pogge, D. M. Szczygiel, Ying Zu, K. Mogren, Robert J. Siverd, C. Araya Salvo, Chien-Ting J. Chen, Monica Valluri, N. Free, Xiao Che, Ana M. Mosquera, M. Dietrich, Ashley L. King, Keith Horne, S. Rafter, S. G. Sergeev, J. van Saders, V. T. Doroshenko, S. V. Nazarov, Shai Kaspi, Kelly D. Denney, S. A. Cohen, G. A. Borman, Paul Martini, Bradley M. Peterson, I. Ginsburg, Calen B. Henderson, Jonathan C. Bird, Christopher S. Kochanek, Joseph C. Shields, Thomas G. Beatty, Jan Skowron, and D. J. Bord

Subjects
Physics, Active galactic nucleus, 010504 meteorology & atmospheric sciences, Radio galaxy, Balmer series, Astronomy and Astrophysics, Quasar, Astrophysics, 01 natural sciences, Galaxy, Black hole, symbols.namesake, 13. Climate action, Space and Planetary Science, 0103 physical sciences, symbols, Reverberation mapping, Emission spectrum, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences
Abstract

We present velocity-resolved reverberation results for five active galactic nuclei. We recovered velocity-delay maps using the maximum entropy method for four objects: Mrk 335, Mrk 1501, 3C?120, and PG?2130+099. For the fifth, Mrk 6, we were only able to measure mean time delays in different velocity bins of the H? emission line. The four velocity-delay maps show unique dynamical signatures for each object. For 3C?120, the Balmer lines show kinematic signatures consistent with both an inclined disk and infalling gas, but the He II??4686 emission line is suggestive only of inflow. The Balmer lines in Mrk 335, Mrk 1501, and PG?2130+099 show signs of infalling gas, but the He II emission in Mrk 335 is consistent with an inclined disk. We also see tentative evidence of combined virial motion and infalling gas from the velocity-binned analysis of Mrk 6. The maps for 3C?120 and Mrk 335 are two of the most clearly defined velocity-delay maps to date. These maps constitute a large increase in the number of objects for which we have resolved velocity-delay maps and provide evidence supporting the reliability of reverberation-based black hole mass measurements.

Published
2013
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7. A REVERBERATION LAG FOR THE HIGH-IONIZATION COMPONENT OF THE BROAD-LINE REGION IN THE NARROW-LINE SEYFERT 1 Mrk 335

Author

N. Free, Benjamin J. Shappee, Ying Zu, I. Ginsburg, Joseph C. Shields, Christopher S. Kochanek, K. Z. Stanek, V. T. Doroshenko, Thomas G. Beatty, S. V. Nazarov, Richard W. Pogge, J. van Saders, Misty C. Bentz, Calen B. Henderson, B. M. Peterson, K. Mogren, D. M. Szczygiel, Monica Valluri, C. Araya Salvo, Jonathan C. Bird, D. J. Bord, S. A. Cohen, Xiao Che, Kelly D. Denney, Chien-Ting J. Chen, D. N. Okhmat, G. A. Borman, M. Dietrich, Jan Skowron, Yu. S. Efimov, Catherine J. Grier, Mallory Molina, Ana M. Mosquera, S. G. Sergeev, Ashley L. King, Shai Kaspi, Keith Horne, Paul Martini, S. Rafter, and Ondřej Pejcha

Subjects
Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Lag, Continuum (design consultancy), FOS: Physical sciences, Astronomy and Astrophysics, Radius, Astrophysics, 01 natural sciences, Galaxy, Black hole, Space and Planetary Science, Ionization, 0103 physical sciences, Emission spectrum, 010303 astronomy & astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Line (formation)
Abstract

We present the first results from a detailed analysis of photometric and spectrophotometric data on the narrow-line Seyfert 1 galaxy Mrk 335, collected over a 120-day span in the fall of 2010. From these data we measure the lag in the He II 4686 broad emission line relative to the optical continuum to be 2.7 \pm 0.6 days and the lag in the H\beta 4861 broad emission line to be 13.9 \pm 0.9 days. Combined with the line width, the He II lag yields a black hole mass, MBH = (2.6 \pm 0.8)\times 10^7 Msun. This measurement is consistent with measurements made using the H\beta 4861 line, suggesting that the He II emission originates in the same region as H\beta, but at a much smaller radius. This constitutes the first robust lag measurement for a high-ionization line in a narrow-line Seyfert 1 galaxy., Comment: 7 pages, 3 figures. Accepted for publication in ApJ Letters. For a brief video explaining the key results of this paper, see http://www.youtube.com/user/OSUAstronomy#p/a/u/0/Z2UCxQG5iOo

Published
2011
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