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

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

2009-03-18

arxiv.org/abs/0903.3037v2

Astrophys.J.Suppl.186:378-405,2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted by the Astrophysical Journal Supplement Series. 27 pages. This version was accepted by the journal and includes chang

Scientific paper

10.1088/0067-0049/186/2/378

We present the catalog of sources detected in the first 22 months of data from the hard X-ray survey (14--195 keV) conducted with the BAT coded mask imager on the \swift satellite. The catalog contains 461 sources detected above the 4.8 sigma level with BAT. 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 97% of the detections, including the discovery of ~30 galaxies previously unknown as AGN and several new Galactic sources. A total of 266 of the sources are associated with Seyfert galaxies (median redshift z ~ 0.03) or blazars, with the majority of the remaining sources associated with X-ray binaries in our Galaxy. 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 (1 mCrab) over most of the sky in the 14--195 keV band.

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