Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-24
Astronomy and Astrophysics
Astrophysics
Submitted to A&A
Scientific paper
10.1051/0004-6361:20077651
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 GEMS survey demonstrates that the nucleus does not affect significantly 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, but a secondary cold gas supplier (such as minor interactions or self-gravitational instabilities) must also assist.
Georgantopoulos Ioannis
Rovilos Emmanouel
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