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X-ray selected AGN Hosts are Similar to Inactive Galaxies out to z=3: Results from CANDELS/CDF-S | | D.J. Rosario
; M. Mozena
; S. Wuyts
; K. Nandra
; A. Koekemoer
; E. McGrath
; N. Hathi
; A. Dekel
; J. Donley
; J.S. Dunlop
; S.M. Faber
; H. Ferguson
; M. Giavalisco
; N. Grogin
; Y. Guo
; J. Newman
; D.D. Kocevski
; D.C. Koo
; R. Somerville
; | | Date: |
17 Oct 2011 | | Abstract: | We use multi-band high-resolution photometry in the 4 MSec Chandra Deep
Field-South (CDF-S), in particular imaging from the Cosmic Assembly Near-IR
Deep Legacy Survey (CANDELS), to explore the nuclear and extended colors, color
gradients and stellar populations of X-ray selected AGN host galaxies out to
z=3. Based on a study of their central light, we develop X-ray based criteria
to exclude objects with strong AGN contamination. We use stellar masses from
the FIREWORKS database to understand and account for stellar mass selection
effects, and carefully study, for the first time, the resolved host galaxy
properties of AGNs at z~2 in the rest-frame optical light without substantial
nuclear contamination. We find that AGN hosts span a large range of stellar
masses, colors and color gradients at these redshifts. In terms of their colors
and stellar population properties, they are very similar to inactive galaxies
of the same stellar mass. At z~1, we find a slightly narrower range in host
colors compared to inactive galaxies, as well as hints of more recent
star-formation. These differences are weaker or non-existent among AGN hosts at
z~2. Finally, we find that AGNs show flatter color gradients compared to
inactive galaxies, with the degree of flatness correlating with AGN luminosity,
implying that, even among obscured AGNs with no clear nuclear contamination,
central photometry can be affected by nuclear activity, perhaps through
scattered AGN light. We discuss the importance of AGN driven feedback in the
quenching of galaxies at z>~1 and speculate on possible evolution in the
relationship between black hole accretion and the host galaxy at high
redshifts. | | Source: | arXiv, 1110.3816 | | Services: | Forum | Review | PDF | Favorites | |
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