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| Paper: |
A Rich Bounty of AGN in the 9 deg2 Bootes Survey: High-z Obscured AGN and Large-Scale Structure |
| Volume: |
379, Cosmic Frontiers |
| Page: |
181 |
| Authors: |
Hickox, R.C.; Jones, C.; Forman, W.R.; Murray, S.S.; Kenter, A.; Brodwin M.; the Xbootes Team; the NOAO Deep Wide-Field Survey Team; the Spitzer IRAC Shallow Survey Team; the AGES Team |
| Abstract: |
We use observations from the 9 square degree multiwavelength survey in Boötes to identify hundreds of obscured active galactic nuclei (AGN) with high redshifts (z > 0.7), luminosities (Lbol > 1045 ergs s−1), and moderate obscuring columns (NH > 1022 cm−2), and to measure the clustering properties of X-ray AGN at z > 1. In the Boötes 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 666 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 threedimensional two-point correlation function for X-ray selected AGN. |
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