Clustering of X-Ray-Selected AGN

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 s...

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Main Authors: N. Cappelluti, V. Allevato, A. Finoguenov
Format: Article
Language:English
Published: Wiley 2012-01-01
Series:Advances in Astronomy
Online Access:http://dx.doi.org/10.1155/2012/853701
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author N. Cappelluti
V. Allevato
A. Finoguenov
author_facet N. Cappelluti
V. Allevato
A. Finoguenov
author_sort N. Cappelluti
collection DOAJ
description 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 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 results is that X-ray AGNs 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.
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spelling doaj-art-913bdd61e12d45c6b9e9e12b29c684f12025-02-03T06:01:37ZengWileyAdvances in Astronomy1687-79691687-79772012-01-01201210.1155/2012/853701853701Clustering of X-Ray-Selected AGNN. Cappelluti0V. Allevato1A. Finoguenov2Osservatorio Astronomico di Bologna, INAF, Via Ranzani 1, 40127 Bologna, ItalyMax-Planck-Institut für Plasmaphysik and Excellence Cluster Universe, Boltzmannstrasse 2, 85748 Garching, GermanyUniversity of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USAThe 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 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 results is that X-ray AGNs 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.http://dx.doi.org/10.1155/2012/853701
spellingShingle N. Cappelluti
V. Allevato
A. Finoguenov
Clustering of X-Ray-Selected AGN
Advances in Astronomy
title Clustering of X-Ray-Selected AGN
title_full Clustering of X-Ray-Selected AGN
title_fullStr Clustering of X-Ray-Selected AGN
title_full_unstemmed Clustering of X-Ray-Selected AGN
title_short Clustering of X-Ray-Selected AGN
title_sort clustering of x ray selected agn
url http://dx.doi.org/10.1155/2012/853701
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AT vallevato clusteringofxrayselectedagn
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