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K. Brand (NOAO), M. J. I. Brown (Princeton), A. Dey, B.T. Jannuzi (NOAO), A.T. Kenter (CfA), C.S. Kochanek (Ohio State), D. Fabricant, G.G. Fazio, W.R. Forman, P.J. Green, C.J. Jones (CfA), B.R. McNamara (Ohio), S.S. Murray (CfA), J. Najita (NOAO), M. Rieke (Steward), J.C. Shields (Ohio), A. Vikhlinin (CfA)
We present results regarding the optical counterparts of the 5-ks Chandra observations of the Boötes region of the NOAO Deep Wide-Field Survey (NDWFS). This survey is unique in the unprecedented large (~9 deg2), contiguous region imaged in X-ray and in the complementary deep optical and near-IR observations provided by the NDWFS. We detect optical counterparts for 98% of the 3,213 X-ray detected sources within the NDWFS area. The optical colors suggest that the bright galaxies are a combination of z<1 massive early-type galaxies and bluer star forming galaxies whereas the majority of the bright stellar sources are quasars at redshifts z~1-3. We select a large sub-sample of objects with large X-ray to optical flux ratios which are likely high redshift and/or obscured AGN. The 75 X-ray sources with no optical counterparts to R~26 have hard X-ray spectra and are also likely to be high redshift obscured AGN.
Our research is supported by the National Optical Astronomy Observatory which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under a cooperative agreement with the National Science Foundation. Support for this work was provided by the National Aeronautics and Space Administration through Chandra Award Number GO3-4176 issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics and Space Administration under contract NAS8-39073.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.