NED Abstract 
Copyright by American Astronomical Society.
Reproduced by permission

2005ApJS..161....9K

XBootes: An X-Ray Survey of the NDWFS Bootes Field. II. The X-Ray Source
Catalog 

Almus Kenter, Stephen S. Murray, William R. Forman, Christine Jones, Paul
Green, Christopher S. Kochanek, Alexey Vikhlinin, Daniel Fabricant, Giovani
Fazio, Katherine Brand, Michael J. I. Brown, Arjun Dey, Buell T. Jannuzi,
Joan Najita, Brian McNamara, Joseph Shields, and Marcia Rieke 

Abstract. We present results from a Chandra survey of the 9 deg^2^
Bootes field of the NOAO Deep Wide-Field Survey (NDWFS). This XBootes
survey consists of 126 separate contiguous ACIS-I observations each of
approximately 5000 s in duration. These unique Chandra observations
allow us to search for large-scale structure and to calculate X-ray
source statistics over a wide, contiguous field of view with arcsecond
angular resolution and uniform coverage. Optical spectroscopic follow-up
observations and the rich NDWFS data set will allow us to identify and
classify these X-ray -- selected sources. Using wavelet decomposition,
we detect 4642 point sources with n >= 2 counts. In order to keep our
detections ~99% reliable, we limit our list to sources with n >= 4
counts. For a 5000 s observation and assuming a canonical unabsorbed
active galactic nucleus (AGN) type X-ray spectrum, a 4 count on-axis
source corresponds to a flux of 4.7x10^-15^ ergs cm^-2^ s^-1^ in the
soft (0.5 -- 2 keV) band, 1.5x10^-14^ ergs cm^-2^ s^-1^ in the hard (2
-- 7 keV) band, and 7.8x10^-15^ ergs cm^-2^ s^-1^ in the full (0.5 -- 7
keV) band. The full 0.5 -- 7 keV band n >= 4 count list has 3293 point
sources. In addition to the point sources, 43 extended sources have been
detected, consistent with the depth of these observations and the number
counts of clusters. We present here the X-ray catalog for the XBootes
survey, including source positions, X-ray fluxes, hardness ratios, and
their uncertainties. We calculate and present the differential number of
sources per flux density interval, N(S), for the point sources. In the
soft (0.5 -- 2 keV) band, N(S) is well fitted by a broken power law with
slope of 2.60^+0.11^_-0.12_ at bright fluxes and 1.74^+0.28^_-0.22_ for
faint fluxes. The hard source N(S) is well described by a single power
law with an index of -2.93^+0.09^_-0.09_. 

Key words: Catalogs, Galaxies: Active, Surveys, X-Rays: General