2024-03-28T19:26:01Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1099852020-12-09T16:43:09Zcom_10261_37com_10261_4col_10261_290
Fanali, R.
Caccianiga, A.
Severgnini, P.
Della Ceca, R.
Marchese, E.
Carrera, Francisco J.
Corral, Amalia
Mateos, Silvia
2015-01-30T11:41:38Z
2015-01-30T11:41:38Z
2013
Monthly Notices of the Royal Astronomical Society 433(1): 648-658 (2013)
http://hdl.handle.net/10261/109985
10.1093/mnras/stt757
http://dx.doi.org/10.13039/501100003407
http://dx.doi.org/10.13039/501100003329
We study the link between the X-ray emission in radio-quiet active galactic nuclei (AGN) and the accretion rate on the central supermassive black hole using a statistically well-defined and representative sample of 71 type 1 AGN 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, Γ, and the X-ray'loudness', and the accretion rate, both absolute (Ṁ) and normalized to the Eddington luminosity(Eddington ratio, λ).We parametrize the X-ray loudness using three different quantities: the bolometric correction Kbol, the two-point spectral index αOX and the disc/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 Γ- λ correlation. The two proxies usually adopted in the literature to quantify the X-ray loudness of an AGN, i.e. Kbol and αOX, behave differently, with Kbol being more sensitive to the Eddington ratio and aOX 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.
eng
openAccess
Studying the relationship between X-ray emission and accretion in AGN using the XMM-Newton bright serendipitous survey
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