학술논문
SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT.VI. REVERBERATING DISK MODELS FOR NGC 5548
Document Type
article
Author
Starkey, D; Horne, Keith; Fausnaugh, MM; Peterson, BM; Bentz, MC; Kochanek, CS; Denney, KD; Edelson, R; Goad, MR; De Rosa, G; Anderson, MD; Arévalo, P; Barth, AJ; Bazhaw, C; Borman, GA; Boroson, TA; Bottorff, MC; Brandt, WN; Breeveld, AA; Cackett, EM; Carini, MT; Croxall, KV; Crenshaw, DM; Bontà, E Dalla; De Lorenzo-Cáceres, A; Dietrich, M; Efimova, NV; Ely, J; Evans, PA; Filippenko, AV; Flatland, K; Gehrels, N; Geier, S; Gelbord, JM; Gonzalez, L; Gorjian, V; Grier, CJ; Grupe, D; Hall, PB; Hicks, S; Horenstein, D; Hutchison, T; Im, M; Jensen, JJ; Joner, MD; Jones, J; Kaastra, J; Kaspi, S; Kelly, BC; Kennea, JA; Kim, SC; Kim, M; Klimanov, SA; Korista, KT; Kriss, GA; Lee, JC; Leonard, DC; Lira, P; MacInnis, F; Manne-Nicholas, ER; Mathur, S; McHardy, IM; Montouri, C; Musso, R; Nazarov, SV; Norris, RP; Nousek, JA; Okhmat, DN; Pancoast, A; Parks, JR; Pei, L; Pogge, RW; Pott, J-U; Rafter, SE; Rix, H-W; Saylor, DA; Schimoia, JS; Schnülle, K; Sergeev, SG; Siegel, MH; Spencer, M; Sung, H-I; Teems, KG; Turner, CS; Uttley, P; Vestergaard, M; Villforth, C; Weiss, Y; Woo, J-H; Yan, H; Young, and S; Zheng, W; Zu, Y
Source
The Astrophysical Journal. 835(1)
Subject
Language
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 oto 9157 A o) 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 = 36° ±10° temperature T1 = 44 ±6 ) × 10 3 K at 1 light day from the black hole, and a temperatureradius slope (T ∞r-a) of a = 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.