X-ray AGN in the XMM-LSS galaxy clusters: no evidence of AGN suppression

Abstract

We present a study of the overdensity of X-ray selected AGN in 33 galaxy clusters in the XMM-LSS field, up to redhift z=1.05. Previous studies have shown that the presence of X-ray selected AGN in rich galaxy clusters is suppressed. In the current study we investigate the occurrence of X-ray selected AGN in low and moderate X-ray luminosity galaxy clusters. Due to the wide contiguous XMM-LSS survey area we are able to extend the study to the cluster outskirts. We therefore determine the projected overdensity of X-ray point-like sources out to 6r_{500} radius. To provide robust statistical results we also use a stacking analysis of the cluster projected overdensities. We investigate whether the observed X-ray overdensities are to be expected by estimating also the corresponding optical galaxy overdensities. We find a positive X-ray projected overdensity at the first radial bin, which is however of the same amplitude as that of optical galaxies. Therefore, no suppression of X-ray AGN activity with respect to the field is found, implying that the mechanisms responsible for the suppression are not so effective in lower density environments. After a drop to roughly the background level between 2 and 3r_{500}, the X-ray overdensity exhibits a rise at larger radii, significantly larger than the corresponding optical overdensity. Finally, using redshift information of all optical counterparts, we derive the spatial overdensity profile of the clusters. We find that the agreement between X-ray and optical overdensities in the first radial bin is also suggested in the 3-dimensional analysis. However, we argue that the X-ray overdensity "bump" at larger radial distance is probably a result of flux boosting by gravitational lensing of background QSOs. For high redshift clusters an enhancement of X-ray AGN activity in their outskirts is still possible.

16 pages. Accepted for publication in A&A

References in corpus (17)

• The Importance of Satellite Quenching for the Build-Up of the Red Sequence of Present Day Galaxies
• The bulk of the black hole growth since z~1 occurs in a secular universe: No major merger-AGN connection
• On the prevalence of radio-loud AGN in brightest cluster galaxies: implications for AGN heating of cooling flows
• Fueling Low-Level AGN Activity Through the Stochastic Accretion of Cold Gas
• The DEEP2 Galaxy Redshift Survey: Evolution of the Color-Density Relation at 0.4 < z < 1.35
• The Subaru/XMM-Newton Deep Survey (SXDS): III. X-Ray Data
• The XMM-Newton wide-field survey in the COSMOS field II: X-ray data and the logN-logS
• The DEEP2 galaxy redshift survey: the evolution of the blue fraction in groups and the field
• The XMM Large Scale Structure survey: The X-ray pipeline and survey selection function
• Spectroscopic Confirmation of a Large AGN Population in Clusters of Galaxies
• The AGN fraction - velocity dispersion relation in clusters of galaxies
• The XMM-LSS Survey: A well controlled X-ray cluster sample over the D1 CFHTLS area
• A 3-Dimensional study of the Local Environment of Bright IRAS Galaxies: The AGN/Starburst connection
• X-ray Point Sources and Radio Galaxies in Clusters of Galaxies
• Classification and environmental properties of X-ray selected point-like sources in the XMM-LSS field
• Shrinking of Cluster Ellipticals: a Tidal Stripping explanation and Implications for the Intra-Cluster Light
• AGN triggering in the infall regions of distant X-ray luminous galaxy clusters at 0.9 < z <~ 1.6

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