Probing the Accretion Disc--Corona Connection in AGN through X-ray and Optical Variability

Details Probing the Accretion Disc--Corona Connection in AGN through X-ray and Optical Variability Probing the Accretion Disc--Corona Connection in AGN through X-ray and Optical Variability

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..408..296a&link_type=abstract

The Starburst-AGN Connection. ASP Conference Series, Vol. 408, proceedings of the conference held 27-31 October 2008, at Shangha

Astronomy and Astrophysics

Astronomy

1

Scientific paper

One way to probe the uncertain connection between the optically-emitting accretion disc and the X-ray emitting corona in AGN is to follow the variability in both energy bands and establish their correlation. With this aim we have monitored a sample of 10 AGN in X-ray and optical bands over several years. Rapid, small amplitude fluctuations in the optical band are consistent with reprocessing of variable X-ray flux by a standard thin accretion disc, if the X-ray emitting corona is located at a few tens of gravitational radii from the disc. The long term, high amplitude optical fluctuations, however, appear intrinsic to the optical emitting region and suggest a propagation of these fluctuations from the thin disc into the corona.

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