Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198...33c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 198, Jan. 1982, p. 33-43.
Astronomy and Astrophysics
Astronomy
10
Angular Resolution, Gamma Ray Telescopes, High Resolution, Masks, Radiation Detectors, Apertures, Cos-B Satellite, Data Reduction, Decoding, Point Sources, Point Spread Functions
Scientific paper
It is shown that a method for improving the angular resolution of a high-energy gamma-ray telescope, incorporating a coded aperture mask combined with a drift chamber pair detector, allows the resolution of the structure of extended sources on a 10 arcmin scale. This represents an improvement of more than an order of magnitude over existing instruments. In addition, a reduction in the observational time required is achieved by means of a two-stage data analysis in which the gamma-ray direction is initially determined from the pair direction, and then the mask decoding is performed over this restricted field of view. The high drift chamber spatial resolution is an essential element of the system. It is found that, with a 1000 sq cm effective detector area, an exposure of a few days suffices for the accurate location of any of the 29 COS-B sources.
Carter J. N.
Frye Glenn M. Jr.
Jenkins Thomas L.
Koga Ryan
Ramsden David
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