Constraints on black hole fuelling modes from the clustering of X-ray AGN

Understand

We present a clustering analysis of X-ray selected AGN by compiling X-ray samples from the literature and re-estimating the dark matter (DM) halo masses of AGN in a uniform manner.

• We find that moderate luminosity AGN (Lx(2-10 keV)=10^42-10^44 erg/sec) in the z=0-1.3 Universe are typically found in DM haloes with masses of ~10^13 Msun.
• We then compare our findings to the theoretical predictions of the coupled galaxy and black hole formation model GALFORM.
• We find good agreement when our calculation includes the hot-halo mode of accretion onto the central black hole.