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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

classification astro-ph.GAastro-ph.HE
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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    astro-ph.CO 2026-08 conditional novelty 7.0 of 10

    A Bayesian re-analysis of 906 OzDES AGN finds that previous reverberation lags, especially for MgII and CIV, are often false positives, with only 3-28% of MgII sources showing simple lags.

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