期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 420, 期 1, 页码 514-525出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.20059.x
关键词
galaxies: active; galaxies: haloes; galaxies: Seyfert; X-rays: diffuse background
资金
- Marie-Curie Reintegration Grant [PERG03-GA-2008-230644]
- Alfred P. Sloan Foundation
- National Aeronautics and Space Administration
- National Science Foundation
- US Department of Energy
- Japanese Mon-bukagakusho
- Max Planck Society
- University of Chicago
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- 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
The clustering properties of moderate-luminosity (L-X = 10(41)-10(44) erg s(-1)) X-ray-selected active galactic nuclei (AGN) at z approximate to 0.1 are explored. X-ray sources in the redshift interval 0.03 < z < 0.2 are selected from a serendipitous XMM survey of the Sloan Digital Sky Survey (SDSS) footprint (XMM/SDSS) and are cross-correlated with the SDSS main galaxy sample. The inferred X-ray AGN autocorrelation function is described by a power law with amplitude r(0) approximate to 5 h(-1) Mpc and slope gamma approximate to 2.0. The corresponding mass of the dark matter haloes that host X-ray AGN at z approximate to 0.1 is approximate to 10(13) h(-1)M circle dot. Comparison with studies at higher redshift shows that this mass scale is characteristic of moderate-luminosity X-ray AGN out to z approximate to 1. Splitting the AGN sample by rest-frame colour shows that X-ray sources in red hosts are more clustered than those associated with blue galaxies, in agreement with results at z approximate to 1. We also find that the host galaxies of X-ray AGN have lower stellar masses compared to the typical central galaxy of a dark matter halo of approximate to 10(13) h(-1) M circle dot. AGN hosts either have experienced less stellar mass growth compared to the average central galaxy of a halo of approximate to 10(13) h(-1) M circle dot or a fraction of them are associated with satellite galaxies.
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