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28 March 2024
 
  » arxiv » astro-ph/0512343

 Article overview


The Chandra XBootes Survey - III: Optical and Near-IR 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 ; Alexey Vikhlinin ;
Date 13 Dec 2005
AbstractThe 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-IR observations. We present a catalog of the optical counterparts to the 3,213 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 sub-sample 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 AGN. 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 AGN.
Source arXiv, astro-ph/0512343
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