Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 414, Issue 2, Pages 992-1010Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.18387.x
Keywords
methods: data analysis; galaxies: active; galaxies: Seyfert; X-rays: diffuse background; astronomical data bases: surveys
Categories
Funding
- Marie-Curie Reintegration Grant [PERG03-GA-2008-230644]
- NSF [AST95-09298, AST-0071048, AST-0071198, AST-0507428, AST-0507483]
- NASA [NNG04GC89G]
- Alfred P. Sloan Foundation
- National Aeronautics and Space Administration
- National Science Foundation
- US Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
- University of Chicago
- Fermilab
- Institute for Advanced Study
- The Johns Hopkins University
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- University of Pittsburgh
- Princeton University
- United States Naval Observatory
- University of Washington
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A new serendipitous XMM survey in the area of the Sloan Digital Sky Survey is described (XMM/SDSS), which includes features such as merging of overlapping fields to increase the sensitivity to faint sources, use of a new parametrization of the XMM point spread function for the source detection and photometry and an accurate estimation of the survey sensitivity. About 40 000 X-ray point sources are detected over a total area of 122 deg(2). A subsample of 209 sources detected in the 2-8 keV spectral band with SDSS spectroscopic redshifts in the range of 0.03 < z < 0.2, optical magnitudes r < 17.77 mag and log L-X(2-10 keV) > 41.5 (erg s(-1)) is selected to explore their distribution on the colour-magnitude diagram. This is compared with the colour-magnitude diagram of X-ray AGN in the AEGIS field at z approximate to 0.8. We find no evidence for evolution of the rest-frame colours of X-ray AGN hosts from z = 0.8 to 0.1. This suggests that the dominant accretion mode of the AGN population, which is expected to imprint on the properties of their host galaxies, does not change since z = 0.8. This argues against scenarios that attribute the rapid decline of the accretion power of the Universe with time (1 dex since z = 0.8) to changes in the AGN fuelling/triggering mode.
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