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SPACE TELESCOPE and OPTICAL REVERBERATION MAPPING PROJECT.VI. REVERBERATING DISK MODELS for NGC 5548
- Source :
- Astrophysical Journal; vol 835, iss 1, 65-65; 0004-637X
- Publication Year :
- 2017
-
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.
Details
- Database :
- OAIster
- Journal :
- Astrophysical Journal; vol 835, iss 1, 65-65; 0004-637X
- Notes :
- application/pdf, Astrophysical Journal vol 835, iss 1, 65-65 0004-637X
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1367499595
- Document Type :
- Electronic Resource