Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3509k&link_type=abstract
American Astronomical Society, HEAD meeting #11, #35.09; Bulletin of the American Astronomical Society, Vol. 41, p.716
Astronomy and Astrophysics
Astronomy
Scientific paper
We investigate the clustering properties of 1550 broad-line AGNs at z=0.25 detected in the ROSAT All-Sky Survey (RASS) through their measured cross-correlation function (CCF) with 46000 Luminous Red Galaxies (LRGs) in the Sloan Digital Sky Survey. By measuring the cross-correlation of our AGN sample with a larger tracer set of LRGs, we both minimize short noise errors due to the relatively small AGN sample size and avoid systematic errors due to the spatially-varying Galactic absorption that would affect direct measurements of the auto-correlation function (ACF) of the AGN sample. We therefore infer the ACF of the low-z RASS-selected AGN from measurements of the AGN-LRG CCF. A strong clustering signal is detected at a level of 11 sigma. The inferred ACF correlation length for the total RASS-AGN yield r0=4.3+0.4-0.4 h-1 Mpc (for a fixed gamma=1.9;
Dividing the sample into low and high LX samples at LX= 1044 erg/s (0.5-10 keV), we detect an X-ray luminosity dependence of the clustering signal at the 2.5 sigma level (low LX sample: r0=3.3+0.6-0.7 h-1 Mpc; high LX sample: r0=5.5+0.6-0.7 h-1 Mpc, for a fixed gamma=1.9). Consequently, broad line X-ray selected AGN in the chosen redshift/luminosity range have a relatively low clustering scale length, in contrast to larger values at z 1 reported in the literature from deep surveys. The typical dark matter halo masses harboring our AGN are log M =12.58+0.20-0.33, 11.83+0.55-2.53, 13.10+0.24-0.43 h-1 Msun, for the total, low LX, and high LX RASS-AGN sample, respectively. Halo occupation distribution modeling of these results will be presented in a companion paper.
Coil Alison L.
Krumpe Mirko
Miyaji Takamitsu
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