The role of AGN in the colour transformation of galaxies at redshifts z~1

Details The role of AGN in the colour transformation of galaxies at redshifts z~1 The role of AGN in the colour transformation of galaxies at redshifts z~1

2008-01-14

arxiv.org/abs/0801.2160v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2008.12962.x

We explore the role of AGN in establishing and/or maintaining the bimodal colour distribution of galaxies by quenching their star-formation and hence, causing their transition from the blue to the red cloud. Important tests for this scenario include (i) the X-ray properties of galaxies in the transition zone between the two clouds and (ii) the incidence of AGN in post-starbursts, i.e. systems observed shortly after (<1Gyr) the termination of their star-formation. We perform these tests by combining deep Chandra observations with multiwavelength data from the AEGIS survey. Stacking the X-ray photons at the positions of galaxies (0.4

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