Locating very high energy gamma-ray sources with arcminute accuracy

Details Locating very high energy gamma-ray sources with arcminute accuracy Locating very high energy gamma-ray sources with arcminute accuracy

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377l..97a&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. L97-L100. Research supported by Smithsonia

Astronomy and Astrophysics

Astronomy

46

Crab Nebula, Gamma Ray Astronomy, Cerenkov Radiation, Cos-B Satellite, Photons

Scientific paper

The angular accuracy of gamma-ray detectors is intrinsically limited by the physical processes involved in photon detection. Although a number of pointlike sources were detected by the COS B satellite, only two have been unambiguously identified by time signature with counterparts at longer wavelengths. By taking advantage of the extended longitudinal structure of VHE gamma-ray showers, measurements in the TeV energy range can pinpoint source coordinates to arcminute accuracy. This has now been demonstrated with new data analysis procedures applied to observations of the Crab Nebula using Cherenkov air shower imaging techniques. With two telescopes in coincidence, the individual event circular probable error will be 0.13 deg. The half-cone angle of the field of view is effectively 1 deg.

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