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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 &lt;  z  &lt; 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  r  0 ≈ 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 ≈10 13   h  −1  M ⊙  or a fraction of them are associated with satellite galaxies.

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