Bibcode
Starkey, D.; Horne, Keith; 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.; Efimova, 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.; Pott, 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.
Bibliographical reference
The Astrophysical Journal, Volume 835, Issue 1, article id. 65, 15 pp. (2017).
Advertised on:
1
2017
Journal
Citations
77
Refereed citations
71
Description
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
\mathringA to 9157 \mathringA ) 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^\circ +/- 10^\circ , temperature {T}1=(44+/- 6)×
{10}3 K at 1 light day from the black hole, and a
temperature–radius slope (T\propto {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/{L}{Edd}=0.1.
Related projects
Formation and Evolution of Galaxies: Observations in Infrared and other Wavelengths
This IAC research group carries out several extragalactic projects in different spectral ranges, using space as well as ground-based telescopes, to study the cosmological evolution of galaxies and the origin of nuclear activity in active galaxies. The group is a member of the international consortium which built the SPIRE instrument for the
Ismael
Pérez Fournon
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology
We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.
Ignacio
Martín Navarro