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27 April 2024 |
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The DEEP2 Galaxy Redshift Survey: The Red Sequence AGN Fraction and its Environment and Redshift Dependence | | Antonio D. Montero-Dorta
; Darren J. Croton
; Renbin Yan
; Michael C. Cooper
; Jeffery A. Newman
; Antonis Georgakakis
; Francisco Prada
; Marc Davis
; Kirpal Nandra
; Alison Coil
; | | Date: |
17 Jan 2008 | | Abstract: | We measure the dependence of the 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 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 7. We speculate
on possible interpretations of our results. | | Source: | arXiv, 0801.2769 | | Services: | Forum | Review | PDF | Favorites | |
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