Clustering of Intermediate Luminosity X-ray selected AGN at z ˜ 3

Details Clustering of Intermediate Luminosity X-ray selected AGN at z ˜ 3 Clustering of Intermediate Luminosity X-ray selected AGN at z ˜ 3

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..35..221f&link_type=abstract

XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (

Astronomy and Astrophysics

Astronomy

Galaxies: Active, Galaxies: High-Redshift, Large-Scale Structure Of Universe

Scientific paper

We present the first clustering results of X-ray selected AGN at z ˜ 3. Using Chandra X-ray imaging and UVR optical colors from MUSYC photometry in the ECDF-S field, we selected a sample of 58 z ˜ 3 AGN candidates. From the optical data we also selected 1385 LBG at 2.8 < z < 3.8 with R < 25.5. We performed auto-correlation and cross-correlation analyses, and here we present results for the clustering amplitudes and dark matter halo masses of each sample. For the LBG we find a correlation length of r_{0,LBG} = 6.7+/-0.5 Mpc, implying a bias value of 3.5+/-0.3 and dark matter (DM) halo masses of log(M_min/M_&sun;) = 11.8+/-0.1. The AGN-LBG cross-correlation yields r_{0,PAGN-LBG}}=8.7+/-1.9, implying for AGN at 2.8 < z < 3.8 a bias value of 5.5+/-2.0 and DM halo masses of log(M_min/M_&sun;) = 12.6_{-0.8}^{+0.5}. Evolution of dark matter halos in the Lambda CDM cosmology implies that today these z ˜ 3 AGN are found in high mass galaxies with a typical luminosity 7_{-2}^{+4}L*.

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