The 22-Month Swift-BAT All-Sky Hard X-ray Survey

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  • 18 March 2009
Abstract
We present the catalog of sources detected in the first 22 months of data from the hard X-ray survey (14--195keV) conducted with the BAT coded mask imager on the Swift satellite. The catalog contains 461 sources identified above the 4.8 sigma detection threshold with BAT. A total of 262 of the sources are Seyfert galaxies (median redshift z ~ 0.03) or blazars, with the majority of the remaining sources associated with X-ray binaries in our Galaxy. High angular resolution X-ray data for every source from Swift-XRT or archival data have allowed associations to be made with known counterparts in other wavelength bands for over 90% of the detections, including the discovery of ~30 galaxies previously unknown as AGN and several new Galactic sources. This ongoing survey is the first uniform all sky hard X-ray survey since HEAO-1 in 1977. Since the publication of the 9-month BAT survey we have increased the number of energy channels from 4 to 8 and have substantially increased the number of sources with accurate average spectra. The BAT 22-month catalog is the product of the most sensitive all-sky survey in the hard X-ray band, with a detection sensitivity (4.8 sigma) of 2.2e-11 erg/cm2/s (1mCrab) over most of the sky in the 14--195 keV band.

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