Clustering of X-Ray-Selected AGN

Abstract

The study of the angular and spatial structure of the X-ray sky has been under investigation since the times of the Einstein X-ray Observatory. This topic has fascinated more than two generations of scientists and slowly unveiled an unexpected scenario regarding the consequences of the angular and spatial distribution of X-ray sources. It was first established from the clustering of sources making the CXB that the source spatial distribution resembles that of optical QSO. It then it became evident that the distribution of X-ray AGN in the Universe was strongly reflecting that of Dark Matter. In particular one of the key result is that X-ray AGN are hosted by Dark Matter Halos of mass similar to that of galaxy groups. This result, together with model predictions, has lead to the hypothesis that galaxy mergers may constitute the main AGN triggering mechanism. However detailed analysis of observational data, acquired with modern telescopes, and the use of the new Halo Occupation formalism has revealed that the triggering of an AGN could also be attributed to phenomena like tidal disruption or disk instability, and to galaxy evolution. This paper reviews results from 1988 to 2011 in the field of X-ray selected AGN clustering.

19 pages, 4 Figures, review paper published on Advances in Astronomy Special Issue "Seeking for the Leading Actor on the Cosmic Stage: Galaxies versus Supermassive Black Holes", v2, final version

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Cited by in corpus (26)

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• The Halo Occupation Distribution of SDSS Quasars
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• The nature of the unresolved extragalactic soft CXB
• Tracing Black Hole and Galaxy Co-evolution in the Romulus Simulations
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• Black Hole Demography: From scaling relations to models
• The XXL Survey: VI. The 1000 brightest X-ray point sources
• Power spectrum tomography of dark matter annihilation with local galaxy distribution
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• The Clustering of X-ray Luminous Quasars
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• Clustering of gamma-ray selected 2LAC Fermi Blazars
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