X-ray iron line constraints on the inner accretion disk and black hole spin

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The broad iron line, seen in the X-ray spectra of many AGN, is thought to originate from the inner regions of the black hole accretion disk. I will summarize recent developments in using this line to probe the accretion disk structure, as well as the mass and spin of black holes in Seyfert galaxies. In particular, I will present observational evidence suggesting that the inner regions of the accretion disks in low-luminosity AGN (LLAGN) are distinctly different from those in higher-luminosity AGN. This tentative result lends support to models of LLAGN based upon advective accretion disks. This work was primarily supported through the Hubble Fellowship Program.

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