Starkey, D;
Horne, K;
Fausnaugh, MM;
Peterson, BM;
Bentz, MC;
Kochanek, CS;
Denney, KD;
... Saylor, DA; + view all
(2017)
Space Telescope and Optical Reverberation Mapping Project.vi. Reverberating Disk Models for NGC 5548.
The Astrophysical Journal
, 835
(1)
, Article 65. 10.3847/1538-4357/835/1/65.
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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.
| Type: | Article |
|---|---|
| Title: | Space Telescope and Optical Reverberation Mapping Project.vi. Reverberating Disk Models for NGC 5548 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/835/1/65 |
| Publisher version: | http://doi.org/10.3847/1538-4357/835/1/65 |
| Language: | English |
| Additional information: | Copyright © 2017. The American Astronomical Society. All rights reserved. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1529973 |
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