Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1107t&link_type=abstract
American Astronomical Society, HEAD meeting #9, #11.07; Bulletin of the American Astronomical Society, Vol. 38, p.365
Astronomy and Astrophysics
Astronomy
Scientific paper
The BAT instrument on Swift is a wide field (70° × 100°) coded aperture instrument with a CdZnTe detector array sensitive to energies of 14-200 keV. Each day, the BAT survey typically covers 60% of the sky to a detection limit of 30 milliCrab. BAT makes hard X-ray light curves of similar sensitivity and coverage to the X-ray light curves from XTE/ASM, but in an energy range where sources show remarkably different behavior. Integrating the BAT data produces an all sky map with a source detection limit at 15 months of a few × 10-11 ergs cm-2 s-1, depending on the exposure. This is the first uniform all-sky survey at energies high enough to be unaffected by absorption since HEAO 1 in 1977-8. BAT has detected >200 AGN and >180 galactic sources. At high galactic latitudes, the BAT sources are usually easy to identify, but many are heavily absorbed and there are a few quite surprising identifications. The BAT selected galaxies can be used to calculate LogN/LogS and the luminosity function for AGN which are complete and free from common systematics. Several crucial parameters for understanding the cosmic hard x-ray background are now determined.
Barthelmy Scott D.
BAT Survey Team
Falcone Abraham
Gehrels Neil
Kennea Jaime A.
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