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Title: Space Telescope and Optical Reverberation Mapping Project VI: reverberating Disk Models for NGC 5548
Authors: Starkey, D.
Horne, K.
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.
Arévalo, 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 Bontà, E.
De Lorenzo-Cáceres, A.
Dietrich, M.
Efimova2, 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.
Pott5, J.-U.
Rafter, S. E.
Rix, H.-W.
Saylor, D. A.
Schimoia, J. S.
Schnülle, 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.
First Published: 18-Jan-2017
Publisher: American Astronomical Society, IOP Publishing
Citation: The Astrophysical Journal, 2017, 835(1)
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 ˚A to 9157 ˚A) 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 = 36◦ ± 10◦ , temperature T1 = (44 ± 6) × 103 K at 1 light day from the black hole, and a temperature-radius slope (T ∝ r −α) of α = 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/LEdd = 0.1.
DOI Link: 10.3847/1538-4357/835/1/65
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2017, American Astronomical Society, IOP Publishing. Deposited with reference to the publisher’s open access archiving policy.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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Starkey_2017_ApJ_835_65.pdfPublished (publisher PDF)2.89 MBAdobe PDFView/Open

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