  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,limit ~ 10^{-15} erg/s/cm^{-2} we obtain r_0~
17 +- 5 and 18+- 3 h^{-1} Mpc, for the CDF-N and CDF-S, respectively. We show
that the observed flux-limit clustering trend hints towards an X-ray luminosity
dependent clustering of X-ray selected, $z\sim 1$, AGNs.

Astrophysics