NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-21 T13:09:38 PDT
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For refcode 2002ApJ...581L..71D:
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2002ApJ...581L..71D The Correlation between the X-Ray Spectral Slope and the Fe K{alpha} Line Energy in Radio-quiet Active Galactic Nuclei Gulab Chand Dewangan Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400-005, India; gulab@tifr.res.in Received 2002 August 28; accepted 2002 November 11; published 2002 November 19 ABSTRACT A significant correlation between the Fe K{alpha} line energy and the X-ray spectral slope has been discovered among radio-quiet active galactic nuclei. The ionization stage of the bulk of the Fe K{alpha}-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 K{alpha} line from highly ionized material. In the narrow-line Seyfert 1 galaxies with a steeper X-ray spectrum ({GAMMA}_X_ >~ 2.1), the Fe K{alpha} line originates from highly ionized material. In the Seyfert 1 galaxies and quasars with a flatter X-ray spectrum ({GAMMA}_X_ <~ 2.1), the bulk of the Fe K{alpha} emission arises from near-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 that is likely to be the accretion rate relative to the Eddington rate. Subject headings: accretion, accretion disks - galaxies: active - X-rays: galaxies
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