QSO UV/Optical Continuum Variability and Accretion Disks

Details QSO UV/Optical Continuum Variability and Accretion Disks QSO UV/Optical Continuum Variability and Accretion Disks

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.7805p&link_type=abstract

American Astronomical Society Meeting 203, #78.05; Bulletin of the American Astronomical Society, Vol. 35, p.1325

Astronomy and Astrophysics

Astronomy

Scientific paper

Using SDSS quasar spectra taken at multiple epochs, we have found that the typical flux density differences can be fit by a standard thermal accretion disk model in which the accretion rate has changed from one epoch to the next. This suggests that most of the UV/optical variability is due to processes involving the disk, and that a significant fraction of the spectrum comes directly from the disk. Thus, the UV radiation needed for processes such as line-driven winds could also be emitted by the disk itself. This work is funded in part by the National Science Foundation Grant AST-0071193.

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