Journal Article

The clustering of X-ray-selected active galactic nuclei at <i>z</i>= 0.1

G. Mountrichas and A. Georgakakis

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 1, pages 514-525
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI:
The clustering of X-ray-selected active galactic nuclei at z= 0.1

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The clustering properties of moderate-luminosity () X-ray-selected active galactic nuclei (AGN) at z≈ 0.1 are explored. X-ray sources in the redshift interval 0.03 < z < 0.2 are selected from a serendipitous XMM survey of the Sloan Digital Sky Survey (SDSS) footprint (XMM/SDSS) and are cross-correlated with the SDSS main galaxy sample. The inferred X-ray AGN autocorrelation function is described by a power law with amplitude r0≈ 5 h−1 Mpc and slope γ≈ 2.0. The corresponding mass of the dark matter haloes that host X-ray AGN at z≈ 0.1 is . Comparison with studies at higher redshift shows that this mass scale is characteristic of moderate-luminosity X-ray AGN out to z≈ 1. Splitting the AGN sample by rest-frame colour shows that X-ray sources in red hosts are more clustered than those associated with blue galaxies, in agreement with results at z≈ 1. We also find that the host galaxies of X-ray AGN have lower stellar masses compared to the typical central galaxy of a dark matter halo of . AGN hosts either have experienced less stellar mass growth compared to the average central galaxy of a halo of ≈1013h−1 M or a fraction of them are associated with satellite galaxies.

Keywords: galaxies: active; galaxies: haloes; galaxies: Seyfert; X-rays: diffuse background

Journal Article.  8319 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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