All-wavelength Extended Groth strip International Survey: the environment of X-ray sources at z~1

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dc.creatorGeorgakakis, A.
dc.creatorNandra, K.
dc.creatorLaird, E. S.
dc.creatorCooper, M. C.
dc.creatorGerke, B. F.
dc.creatorNewman, J. A.
dc.creatorCroton, D. J.
dc.creatorDavis, M.
dc.creatorFaber, S. M.
dc.creatorCoil, A. L.
dc.date2006-07-12
dc.date.accessioned2026-07-07T07:15:40Z
dc.date.available2026-07-07T07:15:40Z
dc.descriptionWe explore the environment of z~1 AGN 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 3rd nearest neighbour. Our main result is that X-ray selected AGN at z~1 avoid underdense regions at the 99.89% confidence level. Moreover, although we find that the overall population shares the same (rich) environment with optical galaxies of similar U-B and M_B, there is also tentative evidence (96%) that AGN 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 are found in dense regions.
dc.descriptionaccepted by ApJL
dc.identifierhttps://arxiv.org/abs/astro-ph/0607274
dc.identifierhttp://arxiv.org/abs/astro-ph/0607274
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/113296
dc.subjectAstrophysics
dc.titleAll-wavelength Extended Groth strip International Survey: the environment of X-ray sources at z~1
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