NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-15 T00:59:00 PST
Help | Comment | NED Home

For refcode 2006ApJ...641..140B:
Retrieve 5558 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2006ApJ...641..140B The Chandra XBootes Survey. III. Optical and Near-Infrared Counterparts Kate Brand, Michael J. I. Brown, Arjun Dey, Buell T. Jannuzi, Christopher S. Kochanek, Almus T. Kenter, Daniel Fabricant, Giovanni G. Fazio, William R. Forman, Paul J. Green, Christine J. Jones, Brian R. McNamara, Stephen S. Murray, Joan R. Najita, Marcia Rieke, Joseph C. Shields, and Alexey Vikhlinin Abstract. The XBootes Survey is a 5 ks Chandra survey of the Bootes Field of the NOAO Deep Wide-Field Survey (NDWFS). This survey is unique in that it is the largest (9.3 deg^2^) contiguous region imaged in X-ray with complementary deep optical and near-infrared (near-IR) observations. We present a catalog of the optical counterparts to the 3213 X-ray point sources detected in the XBootes survey. Using a Bayesian identification scheme, we successfully identified optical counterparts for 98% of the X-ray point sources. The optical colors suggest that the optically detected galaxies are a combination of z<1 massive early-type galaxies and bluer star-forming galaxies whose optical AGN emission is faint or obscured, whereas the majority of the optically detected point sources are likely quasars over a large redshift range. Our large-area, X-ray -- bright, optically deep survey enables us to select a large subsample of sources (773) with high X-ray -- to -- optical flux ratios (f_X_/f_o_>10). These objects are likely high-redshift and/or dust-obscured AGNs. These sources have generally harder X-ray spectra than sources with 0.1<f_X_/f_o_<10. Of the 73 X-ray sources with no optical counterpart in the NDWFS catalog, 47 are truly optically blank down to R~25.5 (the average 50% completeness limit of the NDWFS R-band catalogs). These sources are also likely to be high-redshift and/or dust-obscured AGNs. Key words: Galaxies: Active, Surveys, X-Rays: Galaxies
Retrieve 5558 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home