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Title:
A rich bounty of AGN in the 9 square degree Bootes survey: high-z obscured AGN and large-scale structure
Authors:
Hickox, R. C.; Jones, C.; Forman, W. R.; Murray, S. S.; Kenter, A.; Brodwin, M.; XBootes, the Chandra; Deep Wide-Field Survey, NOAO; IRAC Shallow Survey, Spitzer; AGES Teams
Publication:
eprint arXiv:astro-ph/0611654
Publication Date:
11/2006
Origin:
ARXIV
Keywords:
Astrophysics
Comment:
5 pages, 3 figures, to appear in the proceedings of "Cosmic Frontiers", Durham, UK, 31 July - 4 August 2006, ASP Conference Series
Bibliographic Code:
2006astro.ph.11654H

Abstract

We use observations from the 9 square degree multiwavelength survey in Bootes to identify hundreds of obscured active galactic nuclei (AGN) with high redshifts (z > 0.7), luminosities (L_bol > 10^45 ergs/s), and moderate obscuring columns (N_H > 10^22 cm^-2), and to measure the clustering properties of X-ray AGN at z > 1. In the Bootes region, shallow (5 ks) Chandra X-ray observations have detected ~4,000 X-ray sources, and the same region has been mapped with deep optical imaging and by Spitzer IRAC, which detects ~300,000 point sources, of which ~30,000 have detections in all four IRAC bands, for which we can select AGN on the basis of their mid-IR colors. With the MMT/Hectospec we have obtained modest resolution optical spectra for about half the X-ray sources (out to z > 3) and ~20,000 galaxies (out to z = 0.7). With this multiwavelength data we select >400 AGN per square degree (compared to 12 per square degree from SDSS). Among a sample of IRAC-selected AGN we identify 641 candidate obscured objects based on their R band and IRAC luminosities. We use X-ray stacking techniques to verify that they are obscured AGN and measure their absorbing column densities. We also measure the three-dimensional two-point correlation function for X-ray selected AGN.
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