Computer Science – Sound
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0809c&link_type=abstract
American Astronomical Society, HEAD meeting #11, #8.09; Bulletin of the American Astronomical Society, Vol. 41, p.664
Computer Science
Sound
Scientific paper
The turning point in the relation between the X-ray photon index and the Eddington Ratio for AGN that was recently revealed by Constantin et al. (2009) and Gu & Cao (2009), provides new stimulus for investigating: 1) the role of accretion in powering the ambiguous low luminosity AGN and 2) the proposed analogy between accretion onto supermassive and stellar size black holes. We present a new and fundamentally improved analysis of the Gamma-L/Ledd relation for AGN of both type I and II in the local universe, with a significantly larger sample of 400 sources, based on the SDSS DR7 and the Chandra Source Catalog. We present unprecedented statistical constraints on the turning point in this relation, its dependence on the presence or absence of the broad emission, as well as on the relationship between the X-ray and optical emission-line activity. We discuss our results as evidence for (1) an intrinsic switch in the accretion mode from advection-dominated flows to standard (disk/corona) accretion modes in SMBH accretors, similar to what has been seen as individual stellar mass BH systems vary or (2) a trend in intrinsic absorption, providing a sound explanation for the paucity of luminous type II AGN.
Aldcroft Thomas
Anderson Scott
Constantin Anca
Green Paul
Haggard Daryl
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