XBootes Chandra Shallow Survey of the Bootes Region

Details XBootes Chandra Shallow Survey of the Bootes Region XBootes Chandra Shallow Survey of the Bootes Region

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919305m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #193.05; Bulletin of the American Astronomical Society,

Mathematics

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Scientific paper

We used the Chandra X-ray Observatory to survey a 9.3 square degree patch of sky, overlapping with NDWFS on Bootes and similar surveys with the Spitzer Space Telescope and others. The initial Chandra survey consisted of a mosaic of 126 ACIS-I observations of 5 ksec each. In addition for about one half of the region a second set of 5 ksec observations has been obtained for a total of almost 1 million Chandra observing seconds. In the first set of observations, over 4600 sources have been detected, of which about 3500 have 4 or more counts (and no more than 30 are expected to be spurious). We have high probability optical candidates for virtually all of the 4 count or brighter sources, and, for about half of these, we have obtained moderate resolution spectra using the MMT/Hectospec.
The X-ray population of sources is dominated by broad line AGN with a mean redshift of about 1.25. The IRAC infrared colors of the X-ray selected AGN are typical of IR selected AGN. The XBootes catalog contains 36 AGN at high redshift (>3), making it one of the larger samples of these rare, high luminosity objects. We also have detected a large population (about 260, all at redshift <1.0, and the largest sample to date) of X-ray Bright, Optically Normal Galaxies (XBONGS) which fall into four primary classes red ellipticals, blue ellipticals, star forming/interacting systems, and IR-selected AGN.
The spatial distribution of X-ray selected AGN at redshifts below 0.7 match very well the spatial distribution of galaxies. At higher redshifts, voids and filaments continue to be seen in the X-ray data suggesting that X-ray selected AGN are excellent tracers of dark matter halos at high redshifts and can be used to study the evolution of large scale structure with cosmic time.

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