Evidence for Ionized Accretion Disks from Radio-quiet AGNs with Steep X-ray Spectra

Details Evidence for Ionized Accretion Disks from Radio-quiet AGNs with Steep X-ray Spectra Evidence for Ionized Accretion Disks from Radio-quiet AGNs with Steep X-ray Spectra

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..311..337d&link_type=abstract

AGN Physics with the Sloan Digital Sky Survey, Proceedings of a conference held in Princeton, NJ, USA, 27-31 July 2003, Edited b

Physics

Scientific paper

The ionization stage of the bulk of the Fe Kα emitting material is not the same in all active galactic nuclei and is related to the shape of the X-ray continua. Active galactic nuclei with a steep X-ray spectrum tend to have a fluorescence Fe Kα line from highly ionized material. In the narrow-line Seyfert 1 galaxies (NLS1s) with a steeper X-ray spectrum (ΓX ⪆ 2.1), the Fe Kα line originates from highly ionized material. In the Seyfert 1 galaxies and quasars with flatter X-ray spectrum (ΓX ⪉ 2.1), the bulk of the Fe Kα emission arises from nearly neutral or weakly ionized material. The correlation is an important observational characteristic related to the accretion process in radio quiet active galactic nuclei and is driven by a fundamental physical parameter which is likely to be the accretion rate relative to the Eddington rate.

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