Journal
ASTRONOMY & ASTROPHYSICS
Volume 475, Issue 1, Pages 115-120Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20077651
Keywords
galaxies : evolution; X-rays : galaxies; galaxies : fondamental parameters
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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.
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