Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981xras.nasa..599r&link_type=abstract
In NASA. Goddard Space Flight Center X-ray Astronomy in the 1980's p 599-620 (SEE N82-26055 16-88)
Astronomy and Astrophysics
Astrophysics
1
Astrophysics, Scintillation Counters, Spaceborne Astronomy, X Ray Astronomy, Active Galaxies, Background Radiation, Black Holes (Astronomy), Diffuse Radiation, Galactic Radiation, Heao, Oso, Pulsars, Uhuru Satellite
Scientific paper
Past hard X-ray and lower energy satellite instruments are reviewed and it is shown that observation above 20 keV and up to hundreds of keV can provide much valuable information on the astrophysics of cosmic sources. To calculate possible sensitivities of future arrays, the efficiencies of a one-atmosphere inch gas counter (the HEAO-1 A-2 xenon filled HED3) and a 3 mm phoswich scintillator (the HEAO-1 A-4 Na1 LED1) were compared. Above 15 keV, the scintillator was more efficient. In a similar comparison, the sensitivity of germanium detectors did not differ much from that of the scintillators, except at high energies where the sensitivity would remain flat and not rise with loss of efficiency. Questions to be addressed concerning the physics of active galaxies and the diffuse radiation background, black holes, radio pulsars, X-ray pulsars, and galactic clusters are examined.
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