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T. Miyaji (CMU), COSMOS XMM-Newton Team, COSMOS Team
We report our first results on the angular structure in the X-ray sources detected in the first-year XMM-Newton Observations on the 2 deg2 COSMOS-field. We were able to measure the angular auto-correlation functions (ACFs) down to ~ 0.5 arcmin up to ~10-20 arcmin for the X-ray point sources (AGN dominated) detected in 0.5-2, 2-4.5, and 4.5-10 keV bands. We have used the expected redshift distributions from the latest AGN population synthesis models and/or AGN luminosity functions to invert the ACF using Limber's equation and calculated the correlation lengths.
We also present the results from the cross-correlation function (CCF) between the X-ray sources and galaxies divided into photometric redshift bins. By correlating with a much larger number of galaxies, the CCF can measure the environment of AGNs in a much better statistical precision. We discuss redshift dependence of the AGN clustering properties through the CCF.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.