CONSTRAINING HALO OCCUPATION PROPERTIES OF X-RAY ACTIVE GALACTIC NUCLEI USING CLUSTERING OF CHANDRA SOURCES IN THE BOOeTES SURVEY REGION
- Dipartimento di Astronomia, Universita di Padova, Vicolo dell'Osservatorio 2, 35122 Padova (Italy)
- Department of Astrophysical Sciences, Princeton University, NJ 08544 (United States)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
- Department of Physics, Durham University, Durham, DH1 3LE (United Kingdom)
- Department of Astronomy, Ohio State University, Columbus, OH 43210 (United States)
- Department of Astronomy and Astrophysics, Kavli Institute for Cosmological Physics, E. Fermi Institute, University of Chicago, Chicago, IL 60637 (United States)
We present one of the most precise measurements to date of the spatial clustering of X-ray-selected active galactic nuclei (AGNs) using a sample derived from the Chandra X-ray Observatory survey in the Booetes field. The real-space two-point correlation function over a redshift interval from z = 0.17 to z {approx} 3 is well described by the power law, {xi}(r) = (r/r{sub 0}){sup -}{gamma}, for comoving separations r {approx}< 20 h{sup -1} Mpc. We find {gamma} = 1.84 {+-} 0.12 and r{sub 0} consistent with no redshift trend within the sample (varying between r{sub 0} = 5.5 {+-} 0.6 h{sup -1} Mpc for (z) = 0.37 and r{sub 0} = 6.9 {+-} 1.0 h{sup -1} Mpc for (z) = 1.28). Furthermore, we are able to measure the projections of the two-point correlation function both on the sky plane and in the line of sight. We use these measurements to show that the Chandra/Booetes AGNs are predominantly located at the centers of dark matter halos with circular velocity v{sub max} > 320 km s{sup -1} or M{sub 180} > 4.1 x 10{sup 12} h{sup -1} M{sub sun}, and tend to avoid satellite galaxies in halos of this or higher mass. The halo occupation properties inferred from the clustering properties of Chandra/Booetes AGNs-the mass scale of the parent dark matter halos, the lack of significant redshift evolution of the clustering length, and the low satellite fraction-are broadly consistent with the Hopkins et al. scenario of quasar activity triggered by mergers of similarly sized galaxies.
- OSTI ID:
- 21587313
- Journal Information:
- Astrophysical Journal, Vol. 741, Issue 1; Other Information: DOI: 10.1088/0004-637X/741/1/15; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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