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

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arxiv 1611.06051 v2 pith:JFS75SM2 submitted 2016-11-18 astro-ph.GA astro-ph.HE

D. Starkey , Keith Horne , M. M. Fausnaugh , B. M. Peterson , M. C. Bentz , C. S. Kochanek , K. D. Denney , R. Edelson
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M. R. Goad G. De Rosa M. D. Anderson P. Arevalo A. J. Barth C. Bazhaw G. A. Borman T. A. Boroson M. C. Bottorff W. N. Brandt A. A. Breeveld E. M. Cackett M. T. Carini K. V. Croxall D. M. Crenshaw E. Dalla Bonta A. De Lorenzo-Caceres M. Dietrich 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 M. D. Joner J. Jones J. Kaastra S. Kaspi B. C. Kelly J. A. Kennea S. C. Kim M. Kim S. A. Klimanov K. T. Korista G. A. Kriss J. C. Lee D. C. Leonard 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 J. R. Parks L. Pei R. W. Pogge J.-U. Pott S. E. Rafter H.W. Rix D. A. Saylor J. S. Schimoia K. Schnulle S. G. Sergeev M. H. Siegel M. Spencer H.-I. Sung K. G. Teems C. S. Turner P. Uttley M. Vestergaard C. Villforth Y. Weiss J.-H. Woo H. Yan S. Young W. Zheng Y. Zu
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keywords disklightaccretioncurvesvariabilitycontinuumopticalperiod
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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

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