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Title

Distant and disk reflection in the average X-ray spectrum of AGN in the Véron-Cetty-Véron catalogue

AuthorsFalocco, Serena ; Carrera, Francisco J. ; Barcons, Xavier ; Miniutti, Giovanni ; Corral, Amalia
Issue Date2014
CitationX-ray Universe (2014)
AbstractThe X-ray spectra of Active Galactic Nuclei (AGN) unveil properties of matter accreting onto the Super Massive Black Hole (SMBH). We investigate the X-ray spectra of AGN focusing on Compton reflection and fluorescence. These are two of the most important processes of interaction between the primary radiation and circum-nuclear material located far away from the SMBH, as indicated by the presence of unresolved spectral emission lines (most notably the Fe line at 6.4 keV rest-frame) in the X-ray spectra of AGN. Contributions from the inner accretion disk, as expected affected by relativistic effects, have been also detected in several AGN. We study the average X-ray spectrum of a sample of 263 AGN totalising 419023 counts in the 2-10 keV rest-frame band distributed among 388 spectra with the EPIC cameras on board of XMM-Newton. The sample was selected from the cross-correlation between the 2XMM X-ray source catalogue and the Vèron-Cetty-Vèron QSO and AGN sample. The most relevant fits to the average spectrum were made using primary radiation with components of Compton reflection and fluorescence. We first considered that these two components are emitted for interaction with matter located far away from the SMBH (e.g. the torus). Then we added the contribution from the accretion disk, smeared by relativistic effects. A reflection model by distant material is very significantly detected, but the fit improves at 6 sigma when neutral disk-reflection is added. The reflection factors are 0.65 for the accretion disk and 0.25 for the torus. Replacing the neutral disk-reflection with low-ionisation disk-reflection fits the data equally well and suggests that the accretion disk is mildly ionised. We detect distant neutral reflection associated with a narrow Fe line in the average spectrum of unabsorbed AGN with average redshift 0.8. Adding the disk-reflection component associated with a relativistic Fe line improves the data description at 6 sigma confidence level, suggesting that both reflection components are present.
DescriptionTrabajo presentado al Symposium the X-ray Universe, celebrado en Dublin (Irlanda) del 16 al 19 de junio de 2014.
URIhttp://hdl.handle.net/10261/170300
Appears in Collections:(IFCA) Comunicaciones congresos
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