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Title:
The DEEP2 Galaxy Redshift Survey: the red sequence AGN fraction and its environment and redshift dependence
Authors:
Montero-Dorta, Antonio D.; Croton, Darren J.; Yan, Renbin; Cooper, Michael C.; Newman, Jeffery A.; Georgakakis, Antonis; Prada, Francisco; Davis, Marc; Nandra, Kirpal; Coil, Alison
Affiliation:
AA(Instituto de Astrofísica de Andalucía (IAA-CSIC), Granada, Andalucía 18080, Spain), AB(Department of Astronomy, University of California, Berkeley, California, CA 94720-3411, USA), AC(Department of Astronomy, University of California, Berkeley, California, CA 94720-3411, USA; Department of Astronomy and Astrophysics, University of Toronto, Toronto M55 3H47, Canada), AD(Department of Astronomy, University of California, Berkeley, California, CA 94720-3411, USA; Spitzer Fellow, Steward Observatory, University of Arizona, Tucson, Arizona, AZ 85721-0064, USA), AE(Department of Astronomy, University of California, Berkeley, California, CA 94720-3411, USA; Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA), AF(Astrophysics Group, Imperial College London, Blackett Laboratory, London, UK), AG(Instituto de Astrofísica de Andalucía (IAA-CSIC), Granada, Andalucía 18080, Spain), AH(Department of Astronomy, University of California, Berkeley, California, CA 94720-3411, USA), AI(Astrophysics Group, Imperial College London, Blackett Laboratory, London, UK), AJ(Hubble Fellow, Steward Observatory, University of Arizona, Tucson, Arizona, AZ 85721-0065, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 392, Issue 1, pp. 125-134. (MNRAS Homepage)
Publication Date:
01/2009
Origin:
MNRAS
MNRAS Keywords:
galaxies: active , galaxies: evolution , galaxies: high-redshift , galaxies: statistics , large-scale structure of Universe
DOI:
10.1111/j.1365-2966.2008.13893.x
Bibliographic Code:
2009MNRAS.392..125M

Abstract

We measure the dependence of the active galactic nuclei (AGN) fraction on local environment at z ~ 1, using spectroscopic data taken from the DEEP2 Galaxy Redshift Survey, and Chandra X-ray data from the All-Wavelength Extended Groth Strip International Survey (AEGIS). To provide a clean sample of AGN, we restrict our analysis to the red sequence population; this also reduces additional colour-environment correlations. We find evidence that high-redshift LINERs in DEEP2 tend to favour higher density environments relative to the red population from which they are drawn. In contrast, Seyferts and X-ray selected AGN at z ~ 1 show little (or no) environmental dependencies within the same underlying population. We compare these results with a sample of local AGN drawn from the Sloan Digital Sky Survey (SDSS). Contrary to the high-redshift behaviour, we find that both LINERs and Seyferts in the SDSS show a slowly declining red sequence AGN fraction towards high-density environments. Interestingly, at z ~ 1 red sequence Seyferts and LINERs are approximately equally abundant. By z ~ 0, however, the red Seyfert population has declined relative to the LINER population by over a factor of ~4.5. We speculate on possible interpretations of our results.
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