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Title:
AEGIS: The Clustering of X-Ray Active Galactic Nucleus Relative to Galaxies at z ~ 1
Authors:
Coil, Alison L.; Georgakakis, Antonis; Newman, Jeffrey A.; Cooper, Michael C.; Croton, Darren; Davis, Marc; Koo, David C.; Laird, Elise S.; Nandra, Kirpal; Weiner, Benjamin J.; Willmer, Christopher N. A.; Yan, Renbin
Affiliation:
AA(Steward Observatory, University of Arizona, Tucson, AZ 85721, USA ; Department of Physics, University of California, San Diego, CA 92093, USA ; Hubble Fellow), AB(Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2BZ, UK ; National Observatory of Athens, V. Paulou & I. Metaxa, 11532, Greece ), AC(Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA ), AD(Steward Observatory, University of Arizona, Tucson, AZ 85721, USA ), AE(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia ), AF(Department of Astronomy, University of California, Berkeley, CA 94720, USA ), AG(University of California Observatories/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA ), AH(Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2BZ, UK ), AI(Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2BZ, UK ), AJ(Steward Observatory, University of Arizona, Tucson, AZ 85721, USA ), AK(Steward Observatory, University of Arizona, Tucson, AZ 85721, USA ), AL(Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada )
Publication:
The Astrophysical Journal, Volume 701, Issue 2, pp. 1484-1499 (2009). (ApJ Homepage)
Publication Date:
08/2009
Origin:
IOP
ApJ Keywords:
galaxies: active, galaxies: high-redshift, large-scale structure of universe, X-rays: galaxies
DOI:
10.1088/0004-637X/701/2/1484
Bibliographic Code:
2009ApJ...701.1484C

Abstract

We measure the clustering of nonquasar X-ray active galactic nucleus (AGN) at z = 0.7-1.4 in the AEGIS field. Using the cross-correlation of 113 Chandra-selected AGN, with a median log L X = 42.8 erg s-1, with ~5000 DEEP2 galaxies, we find that the X-ray AGNs are fitted by a power law with a clustering scale length of r 0 = 5.95 ± 0.90 h -1 Mpc and slope γ = 1.66 ± 0.22. X-ray AGNs have a similar clustering amplitude as red, quiescent and "green" transition galaxies at z ~ 1 and are significantly more clustered than blue, star-forming galaxies. The X-ray AGN clustering strength is primarily determined by the host galaxy color; AGNs in red host galaxies are significantly more clustered than AGNs in blue host galaxies, with a relative bias that is similar to that of red to blue DEEP2 galaxies. We detect no dependence of clustering on optical brightness, X-ray luminosity, or hardness ratio within the ranges probed here. We find evidence for galaxies hosting X-ray AGN to be more clustered than a sample of galaxies with matching joint optical color and magnitude distributions. This implies that galaxies hosting X-ray AGN are more likely to reside in groups and more massive dark matter halos than galaxies of the same color and luminosity without an X-ray AGN. In comparison to optically selected quasars in the DEEP2 fields, we find that X-ray AGNs at z ~ 1 are more clustered than optically selected quasars (with a 2.6σ significance) and therefore may reside in more massive dark matter halos. Our results are consistent with galaxies undergoing a quasar phase while in the blue cloud before settling on the red sequence with a lower-luminosity X-ray AGN, if they are similar objects at different evolutionary stages.
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