Luminosity-dependent X-Ray Active Galactic Nucleus Clustering?

Details Luminosity-dependent X-Ray Active Galactic Nucleus Clustering? Luminosity-dependent X-Ray Active Galactic Nucleus Clustering?

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...674l...5p&link_type=abstract

The Astrophysical Journal, Volume 674, Issue 1, pp. L5-L8.

Astronomy and Astrophysics

Astronomy

23

Cosmology: Observations, Galaxies: Active, Cosmology: Large-Scale Structure Of Universe, Galaxies: Quasars: General, Surveys

Scientific paper

We have analyzed the angular clustering of X-ray-selected active galactic nuclei (AGNs) in different flux-limited subsamples of the Chandra Deep Field North (CDF-N) and South (CDF-S) surveys. We find a strong dependence of the clustering strength on the subsample flux limit, a fact that 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 ergs s-1 cm-2, we obtain r0~=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 toward an X-ray luminosity dependent clustering of X-ray-selected, z~1, AGNs.

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