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Your search keyword '"H.-I. Sung"' showing total 3 results
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3 results on '"H.-I. Sung"'

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

Author

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

Subjects
Doubly ionized oxygen, NDAS, nuclei [galaxies], FOS: Physical sciences, Astrophysics, Expected value, galaxies: active - galaxies: individual (NGC 5548) - galaxies: nuclei - galaxies: Seyfert, medicine.disease_cause, 01 natural sciences, Spitzer Space Telescope, Seyfert [galaxies], 0103 physical sciences, medicine, QB Astronomy, Emission spectrum, 010303 astronomy & astrophysics, QC, QB, Physics, 010308 nuclear & particles physics, Astronomy and Astrophysics, Light curve, Astrophysics - Astrophysics of Galaxies, Monitoring program, QC Physics, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), active [galaxies], individual (NGC 5548) [galaxies], Reverberation mapping, Ultraviolet
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
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2. Space telescope and optical reverberation mapping project. III. Optical continuum emission and broadband time delays in NGC 5548

Author

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

Subjects
Seyfert Supporting [Galaxies], Seyfert [Galaxies], galaxies: active, galaxies: individual (NGC 5548), galaxies: nuclei, galaxies: Seyfert, active [Galaxies], individual (NGC 5548) [Galaxies], Astrophysics::High Energy Astrophysical Phenomena, NDAS, FOS: Physical sciences, machine-readable tables [Material], Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, symbols.namesake, Spitzer Space Telescope, 0103 physical sciences, QB Astronomy, Astrophysics::Solar and Stellar Astrophysics, Emission spectrum, 010303 astronomy & astrophysics, QC, Astrophysics::Galaxy Astrophysics, active, galaxies: individual: NGC 5548, galaxies: nuclei, galaxies: Seyfert [galaxies], QB, Galáxia NGC 5548, Physics, 010308 nuclear & particles physics, Balmer series, Large Binocular Telescope, Astronomy and Astrophysics, Light curve, Astrophysics - Astrophysics of Galaxies, Galaxias seyfert, Galáxias ativas, Wavelength, QC Physics, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), nuclei [Galaxies], Eddington luminosity, symbols, Reverberation mapping, BDC, Nucleo galatico
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
2016
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3. Space Telescope and Optical Reverberation Mapping Project VI: reverberating Disk Models for NGC 5548

Author

Michael T. Carini, S. Mathur, S. G. Sergeev, H.-I. Sung, D. A. Saylor, Shai Kaspi, D. N. Okhmat, A. V. Filippenko, M. C. Bottorff, Marianne Vestergaard, S. Hicks, F. MacInnis, Minjin Kim, T. Hutchison, J. A. Kennea, I. M. McHardy, Kirk T. Korista, Y. Weiss, Carolin Villforth, Bradley M. Peterson, G. De Rosa, C. Bazhaw, E. Dalla Bontà, M. Spencer, Aaron J. Barth, Michael D. Joner, P. Lira, Richard W. Pogge, J. S. Schimoia, D. Horenstein, Ying Zu, S. Geier, A. A. Breeveld, G. A. Borman, Brandon C. Kelly, Phil Evans, M. Dietrich, K. Schnülle, Kelly D. Denney, J.-U. Pott, P. Arévalo, D. A. Starkey, Todd Boroson, J. A. Nousek, J. D. Jones, S. Young, Patrick B. Hall, Justin Ely, Jelle Kaastra, A. de Lorenzo-Cáceres, S. E. Rafter, Misty C. Bentz, A. Pancoast, L. Gonzalez, C. Montouri, J. J. Jensen, E. M. Cackett, M. H. Siegel, Myungshin Im, W. Zheng, S. V. Nazarov, Varoujan Gorjian, Sang Chul Kim, D. Grupe, Catherine J. Grier, D. C. Leonard, H. Yan, K. G. Teems, E. R. Manne-Nicholas, K. Flatland, W. N. Brandt, G. A. Kriss, Ryan Norris, Keith Horne, Jong-Hak Woo, Liuyi Pei, K. V. Croxall, C. S. Turner, J. R. Parks, D. M. Crenshaw, H.-W. Rix, Michael Fausnaugh, Rick Edelson, N. V. Efimova, M. R. Goad, Jonathan Gelbord, J. C. Lee, R. Musso, S. A. Klimanov, N. Gehrels, Phil Uttley, Christopher S. Kochanek, Science & Technology Facilities Council, University of St Andrews. School of Physics and Astronomy, University of St Andrews. St Andrews Centre for Exoplanet Science, and High Energy Astrophys. & Astropart. Phys (API, FNWI)

Subjects
Accretion, Seyfert [Galaxies], active [Galaxies], Point source, individual (NGC 5548) [Galaxies], Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, NDAS, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, medicine.disease_cause, 01 natural sciences, Spectral line, Spitzer Space Telescope, accretion, 0103 physical sciences, medicine, QB Astronomy, Astrophysics::Solar and Stellar Astrophysics, Black-body radiation, 010303 astronomy & astrophysics, accretion, accretion disks, galaxies: individual (NGC 5548), galaxies: nuclei, galaxies: Seyfert, QC, Astrophysics::Galaxy Astrophysics, QB, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, accretion disks, Astronomy and Astrophysics, Light curve, Astrophysics - Astrophysics of Galaxies, Galaxy, active, galaxies: individual: NGC 5548, galaxies: nuclei, galaxies: Seyfert [accretion, accretion disks, galaxies], QC Physics, Space and Planetary Science, nuclei [Galaxies], Astrophysics of Galaxies (astro-ph.GA), Accretion disks, Reverberation mapping, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Ultraviolet
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
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