Query : 2007A&A...475..115R

2007A&A...475..115R - Astronomy and Astrophysics, volume 475, 115-120 (2007/11-3)

Optical colours of AGN in the Extended Chandra Deep Field South: obscured black holes in early type galaxies.


Abstract (from CDS):

We investigate the optical colours of X-ray sources from the Extended Chandra Deep Field South (ECDFS) using photometry from the COMBO-17 survey, aiming to explore AGN - galaxy feedback models. The X-ray sources populate both the ``blue'' and the ``red sequence'' on the colour-magnitude diagram. However, sources in the ``red sequence'' appear systematically more obscured. HST imaging from the ``Galaxy Evolution form morphology and SEDs'' (GEMS) survey demonstrates that the nucleus does not significantly affect the observed colours, and therefore red sources are early-type systems. In the context of AGN feedback models, this means that there is still remaining material after the initial ``blowout''. We argue that this material could not be only left-over from the original merger, and that a secondary cold gas supplier (such as minor interactions or self-gravitational instabilities) must also assist.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - X-rays: galaxies - galaxies: fondamental parameters

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2045 1
2 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1285 1
3 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 746 0

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