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Session 16 - Studies of Black Holes & Future Survey Missions.
Oral session, Monday, June 09
North Main Hall A,

[16.03] HEXIS High Energy X-Ray All-Sky Survey/Monitor

J. Matteson, W. Coburn, W. Heindl, M. Pelling, L. Peterson, R. Rothschild (University of California, San Diego), P. Hink, C. Crabtree (Washington University)

An important step for astrophysics will be a deep survey of the high energy X-ray sky, i.e., >20 keV, where many objects reveal their characteristic spectral signatures and have their greatest luminosity. To maintain complementarity to surveys at lower energies it will be necessary for such a survey to detect and position many thousands of sources. HEXIS (High Energy X-Ray Imaging Spectrometer) is a concept for MIDEX-class mission to accomplish this. It would perform a deep survey and continuous monitoring of nearly the entire sky in the \sim5 - 200 keV band. HEXIS uses arrays of position-sensitive CZT detectors and coded masks to achieve 26 arcmin resolution and a 5 sigma sensitivity (>20 keV) of \sim4 milliCrab in 1 day and 0.2 milliCrab in 1 year. With these capabilities \sim5,000 sources would be discovered and localized, and have their spectra and variability characterized. Hundreds of gamma-ray bursts would be detected each year and localized to <20 arcmin. HEXIS also contains a narrow field, 5^\circ, coded mask imager for detailed studies of selected regions. This has 3 arcmin resolution and is 7 times more sensitive than the all-sky system. The HEXIS concept is described and some expected results are presented.

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