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Get Free AccessWe 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.
D. Starkey, C. A. Gehrels, Keith Horne, Michael Fausnaugh, B. M. Peterson, Misty C. Bentz, C. S. Kochanek, K. D. Denney, Rick Edelson, M. R. Goad, Gisella De Rosa, P. Arévalo, Aaron J. Barth, C. Bazhaw, G. A. Borman, Todd A. Boroson, M. C. Bottorff, W. N. Brandt, A. A. Breeveld, Edward M. Cackett, M. T. Carini, K. V. Croxall, D. M. Crenshaw, E. Dalla Bontà, A. de Lorenzo-Cáceres, M. Dietrich, Н. В. Ефимова, Justin Ely, P. A. Evans, Alexei V Filippenko, I. Flatland, N. Gehrels, S. Geier, J. M. Gelbord, L. González, Varoujan Gorjian, C. J. Grier, D. Grupe, Patrick B. Hall, S. Hicks, D. Horenstein, Taylor A. Hutchison, Myungshin Im, J. J. Jensen, M. D. Joner, Jeremy Jones, J. S. Kaastra, S. Kaspi, Brandon C. Kelly, J. A. Kennea, S. C. Kim, Minjin Kim, S. A. Kilmanov, K. T. Korista, G. A. Kriss, J. C. Lee, Douglas 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, Anna Pancoast, J. R. Parks, L. Pei, Richard W. Pogge, Jörg‐Uwe Pott, S. E. Rafter, Hans‐Walter Rix, D. A. Saylor, J. S. Schimoia, Kirsten Schnuelle, С. Г. Сергеев, M. H. Siegel, M. Spencer, Hyun-Il Sung, K. G. Teems, C. S. Turner, P. Uttley, M. Vestergaard, C. Villforth, Y. Weiss, Jong-Hak Woo, Haojing Yan, S. Young, WeiKang Zheng, Ying Zu (2017). Space Telescope and Optical Reverberation Mapping Project. VI. Reverberating Disk Models for NGS 5548. , 835(1)
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Type
Article
Year
2017
Authors
93
Datasets
0
Total Files
0
Language
en
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