Luminosity Dependent X-ray AGN Clustering ?

Abstract

We have analysed the angular clustering of X-ray selected active galactic nuclei (AGN) in different flux-limited sub-samples of the Chandra Deep Field North (CDF-N) and South (CDF-S) surveys. We find a strong dependence of the clustering strength on the sub-sample flux-limit, a fact which explains most of the disparate clustering results of different XMM and Chandra surveys. Using Limber's equation, we find that the inverted CDF-N and CDF-S spatial clustering lengths are consistent with direct spatial clustering measures found in the literature, while at higher flux-limits the clustering length increases considerably; for example, at $fx,limit10^{-15}erg/s/c{m}^{-2}weobtain{r}_{0}17+-5and18+-3h^{-1}Mpc,fortheCDF-NandCDF-S,respectively.Weshowthattheobservedflux-limitclusteringtrendhintstowardsanX-rayluminositydependentclusteringofX-rayselected,$z\sim 1$, AGNs.

ApJ Letters accepted