The clustering of X-ray selected AGN at z=0.1

Abstract

The clustering properties of moderate luminosity ($L_X=10^{41}-10^{44}\mathrm{erg}{\mathrm{s}}^{-1}$) X-ray selected AGN at $z\approx 0.1$ are explored. X-ray sources in the redshift interval $0.03<z<0.2$ are selected from a serendipitous XMM survey of the SDSS footprint (XMM/SDSS) and are cross-correlated with the SDSS Main galaxy sample. The inferred X-ray AGN auto-correlation function is described by a power law with amplitude $r_0\approx 5$h${}^{-1}$Mpc and slope $\gamma \approx 2.0$. The corresponding mass of the dark matter haloes that host X-ray AGN at $z\approx 0.1$ is $\approx 10^{13} \,h ^{-1} \, M_{\sun}$. Comparison with studies at higher redshift shows that this mass scale is characteristic of moderate luminosity X-ray AGN out to $z\approx 1$. Splitting the AGN sample by rest-frame color shows that X-ray sources in red hosts are more clustered than those associated with blue galaxies, in agreement with results at $z\approx 1$. We also find that the host galaxies of X-ray AGN have lower stellar masses compared to the typical central galaxy of a $\approx 10^{13} \,h ^{-1} \, M_{\sun}$ dark matter halo. AGN hosts either have experienced less stellar mass growth compared to the average central galaxy of a $\approx 10^{13} \,h ^{-1} \, M_{\sun}$ halo or a fraction of them are associated with satellite galaxies.

MNRAS accepted 14 pages, 8 figures, 5 tables

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