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The Swift/BAT Hard X-Ray SurveyThe BAT instrument on Swift is a wide field (70 deg. '100 deg.) 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(exp -11) ergs per square centimeter per second, 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 greater than 200 AGN and greater than 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.
Document ID
20070005089
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Tueller, Jack
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Markwardt, C. B.
(Maryland Univ. Greenbelt, MD, United States)
Mushotzky, R. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Barthelmy, S. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gehrels, N.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Krimm, H. A.
(Universities Space Research Association Greenbelt, MD, United States)
Skinner, G. K.
(Centre d'Etude Spatiale des Rayonnements Toulouse, France)
Falcone, A.
(Pennsylvania State Univ. PA, United States)
Kennea, J. A.
(Pennsylvania State Univ. PA, United States)
Date Acquired
August 24, 2013
Publication Date
October 3, 2006
Subject Category
Astronomy
Meeting Information
Meeting: Workshop on ''The KeV to TeV Connection''
Location: Rome
Country: Italy
Start Date: October 17, 2006
End Date: October 19, 2006
Sponsors: Eureka Scientific, Inc., Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF)
Distribution Limits
Public
Copyright
Other

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