Accretion Disk Temperatures and Continuum Colors in QSOs

Astronomy and Astrophysics – Astronomy

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Scientific paper

Accretion disks around super-massive black holes are widely believed to be the source of the optical/UV continuum in many classes of active galactic nuclei. We study the relationships between the optical/UV continuum colors and the characteristic disk temperature as inferred from the AGN bolometric luminosity and black hole mass. AGN disk models show that, as expected, hotter disks should have bluer continua, notwithstanding random disk inclinations. However, observed colors of SDSS AGN spectra generally do not show the expected trend and in some cases show a reverse trend of redder colors with increasing disk temperature. Possible causes of this discrepancy will be discussed.
The presenting author is supported by Marie Curie Incoming European Fellowship contract MIF1-CT-2005-008762 within the 6th European Community Framework Programme. This research was supported in part by NSF Grants No. PHY99-07949 and AST-0098594, and by Texas Advanced Research Program grant 003658-0177-2001.

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