HEXIS High Energy X-Ray All-Sky Survey/Monitor

Details HEXIS High Energy X-Ray All-Sky Survey/Monitor HEXIS High Energy X-Ray All-Sky Survey/Monitor

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.1603m&link_type=abstract

American Astronomical Society, 190th AAS Meeting, #16.03; Bulletin of the American Astronomical Society, Vol. 29, p.796

Astronomy and Astrophysics

Astrophysics

Scientific paper

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 ~ 5 - 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 ~ 4 milliCrab in 1 day and 0.2 milliCrab in 1 year. With these capabilities ~ 5,000 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(deg) , 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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