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Article overview
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Studying the relationship between X-ray emission and accretion in AGNs using the XMM-Newton Bright Serendipitous Survey | | R. Fanali
; A. Caccianiga
; P. Severgnini
; R. Della Ceca
; E. Marchese
; F.J. Carrera
; A. Corral
; S. Mateos
; | | Date: |
2 May 2013 | | Abstract: | We study the link between the X-ray emission in radio-quiet AGNs and the
accretion rate on the central Supermassive Black Hole using a statistically
well-defined and representative sample of 71 type 1 AGNs extracted from the
XMM-Newton Bright Serendipitous Survey. We search and quantify the statistical
correlations between some fundamental parameters that characterize the X-ray
emission, i.e. the X-ray spectral slope, and the X-ray "loudness", and the
accretion rate, both absolute and normalized to the Eddington luminosity
(Eddington ratio). We parametrize the X-ray loudness using three different
quantities: the bolometric correction, the two-point spectral index and the
disk/corona luminosity ratio. We find that the X-ray spectral index depends on
the normalized accretion rate while the "X-ray loudness" depends on both the
normalized and the absolute accretion rate. The dependence on the Eddington
ratio, in particular, is probably induced by the X-ray spectral slope-Eddington
ratio correlation. The two proxies usually adopted in the literature to
quantify the X-ray loudness of an AGN, i.e. the bolometric correction and the
two-point spectral index, behave differently, with the bolometric correction
being more sensitive to the Eddington ratio and the two-point spectral index
having a stronger dependence with the absolute accretion. The explanation of
this result is likely related to the different sensitivity of the two
parameters to the X-ray spectral index. | | Source: | arXiv, 1305.0564 | | Services: | Forum | Review | PDF | Favorites | |
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