Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...660l..15g&link_type=abstract
The Astrophysical Journal, Volume 660, Issue 1, pp. L15-L18.
Astronomy and Astrophysics
Astronomy
28
Galaxies: Active, Galaxies: High-Redshift, Galaxies: Structure, Surveys
Scientific paper
We explore the environment of z~1 AGNs using a sample of 53 spectroscopically identified X-ray sources in the All-Wavelength Extended Groth Strip International Survey. We quantify the local density in the vicinity of an X-ray source by measuring the projected surface density of spectroscopically identified optical galaxies within a radius defined by the third-nearest neighbor. Our main result is that X-ray-selected AGNs at z~1 avoid underdense regions at a 99.89% confidence level. Moreover, although we find that the overall population shares the same (rich) environment with optical galaxies of the similar U-B and MB, there is also tentative evidence (96%) that AGNs with blue colors (U-B<~1) reside in denser environments compared to optical galaxies. We argue that the results above are a consequence of the whereabouts of massive galaxies capable of hosting supermassive black holes at their centers, with available cold-gas reservoirs, the fuel for AGN activity. At z~1 an increasing fraction of such systems is found in dense regions.
Coil Alison L.
Cooper Martin C.
Croton Darren J.
Davis Martin
Faber Sandra M.
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