NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-11 T04:21:48 PST
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For refcode 2003ApJ...596..944H:
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2003ApJ...596..944H The Serendipitous Extragalactic X-Ray Source Identification Program. I. Characteristics of the Hard X-Ray Sample Fiona A. Harrison, Megan E. Eckart, Peter H. Mao, David J. Helfand, and Daniel Stern Abstract. The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) program is designed to extend greatly the sample of identified extragalactic hard X-ray (2 -- 10 keV) sources at intermediate fluxes (~10^-13^ to 10^-15^ ergs cm^-2^ s^-1^). SEXSI, which studies sources selected from more than 2 deg^2^, provides an essential complement to the Chandra Deep Fields, which reach depths of 5x10^-16^ ergs cm^-2^ s^-1^ (2 -- 10 keV) but over a total area of less than 0.2 deg^2^. In this paper we describe the characteristics of the survey and our X-ray data analysis methodology. We present the cumulative flux distribution for the X-ray sample of 1034 hard sources and discuss the distribution of spectral hardness ratios. Our log N -- log S in this intermediate flux range connects to those found in the Deep Fields, and by combining the data sets, we constrain the hard X-ray population over the flux range in which the differential number counts change slope and from which the bulk of the 2 -- 10 keV X-ray background arises. We further investigate the log N -- log S distribution separately for soft and hard sources in our sample, finding that while a clear change in slope is seen for the softer sample, the hardest sources are well described by a single power law down to the faintest fluxes, consistent with the notion that they lie at lower average redshift. Keywords: Catalogs, Surveys, X-Rays: Galaxies, X-Rays: General
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