Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..apr..d306s&link_type=abstract
American Physical Society, APS/AAPT Joint April Meeting, April 18-21, 1998 Columbus, Ohio, abstract #D3.06
Astronomy and Astrophysics
Astrophysics
Scientific paper
July 2000 will see the launch of HESSI, the High Energy Solar Spectroscopic Imager, a Small Explorer designed for solar x-ray and gamma-ray observations. HESSI has also been optimized, when possible without compromising the solar mission, for astrophysical objectives. It has 9 large high-resolution germanium detectors exposed to half the sky at a time and rotating to occult each other at 15 rpm, resulting in an astrophysics instrument with characteristics of ESA's upcoming INTEGRAL mission, CGRO/BATSE, and Wind/TGRS. The astrophysics studies will include the lineshape and distribution of the Galactic positron annihilation and ^26Al lines, high-resolution spectroscopy of gamma-ray bursts (with an order of magnitude more detector volume than TGRS), and monitoring of the period and luminosity of accreting x-ray pulsars at all periods (BATSE continuous data only cover periods down to 2 s). In the narrow field of view that includes the Sun, HESSI images from 3-100 keV with 2'' resolution using rotating modulation collimators. The Crab Nebula will pass through this field of view once per year, resulting in images almost an order of magnitude finer than that obtained by Pelling et al. (1987, ApJ 319, 416) and covering a wider range of energies.
Lin Robert P.
McTiernan James
Smith Masson D.
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