Swift/BAT Hard X-Ray Survey

Details Swift/BAT Hard X-Ray Survey Swift/BAT Hard X-Ray Survey

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21330103t&link_type=abstract

American Astronomical Society, AAS Meeting #213, #301.03; Bulletin of the American Astronomical Society, Vol. 41, p.269

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The Swift/Burst Alert Telescope hard X-ray survey is a uniform all-sky survey in the 14-200 keV band. Hard X-rays are nearly unaffected by absorption and thus uniquely free of the biases that distort most surveys of X-ray sources. Swift has been in orbit 4 years and the BAT survey sensitivity is continuing to improve as t-0.5 reaching 5σ sensitivities near 600 µCrab over most of the sky, the level originally proposed by the Swift Team. Due to the all-sky coverage, the majority of the sources detected are AGN and BAT will detect 500 AGN when the 48 month data is completely processed. Galactic sources were more than half of the sources in the first 9 months of data, but will only be 200 sources at 48 months. The statistical properties of AGN in the local universe (z < 0.1) are well characterized, providing a key constraint on cosmic X-ray background modeling. The number of blazars detected will be 60, which is adequate to make a luminosity function and determine the contribution of beamed sources to the cosmic background. BAT covers 60% of the sky at a 5σ sensitivity of <40 milliCrab each day. The BAT all-sky monitor provides instant updates on bright sources at swift.gsfc.nasa.gov/docs/swift/results/transients. The BAT survey can provide daily light curves for bright galactic sources and monthly light curves for the majority of extragalactic sources. The long-term variability of a statistically significant sample of AGN that is not contaminated by variations in absorption can now be derived. Swift/XRT and UVOT follow-up of the BAT sources provides secure identifications and uniform soft X-ray, UV and optical photometry. We are currently engaged in efforts to provide uniform radio and optical spectroscopy to complete the wavelength coverage of the BAT AGN, creating a legacy data set for future AGN studies.

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