The clustering of X-ray-selected active galactic nuclei at z= 0.1

Details The clustering of X-ray-selected active galactic nuclei at z= 0.1 The clustering of X-ray-selected active galactic nuclei at z= 0.1

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012mnras.420..514m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 420, Issue 1, pp. 514-525.

Astronomy and Astrophysics

Astronomy

Galaxies: Active, Galaxies: Haloes, Galaxies: Seyfert, X-Rays: Diffuse Background

Scientific paper

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 ≈1013 h-1 M&sun; or a fraction of them are associated with satellite galaxies.

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