Determination of the characteristics of the gamma-ray telescope Gamma-1

Details Determination of the characteristics of the gamma-ray telescope Gamma-1 Determination of the characteristics of the gamma-ray telescope Gamma-1

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ssrv...49..125a&link_type=abstract

Space Science Reviews, Volume 49, Issue 1-2, pp. 125-138

Mathematics

Logic

Scientific paper

The ‘Gamma-1’ telescope has been developed through a collaboration of scientists in the USSR and France in order to conduct γ-ray astronomical observations within the energy range from 50 to 5000 MeV. The major characteristics of the telescope were established by Monte-Carlo simulations and calibrations made with the aid of electron and ‘tagged’ γ-ray beams produced by an accelerator, and these have been found to be as follows: the effective area for photons coming along the instrument's axis varies from about 50 cm2 at E γ = 50 MeV to approximately 230 cm2 at E γ ≥ 300 MeV; the angular resolution (half opening of the cone embracing 68% events) is equal to 2.7° at E γ = 100 MeV, and 1.8° at E γ = 300 MeV; the energy resolution (FWHM) varies from 70% to 35% as the energy of the detected photons increases from 100 to 550 MeV; the telescope's field-of-view at the half-sensitivity level is 300 450 square degrees depending upon the spectrum of the detected radiation, and the event selection logic. Proceeding from the thus obtained characteristics it is demonstrated that a point source producing a photon flux J (E γ ≥ 100 MeV) = 3 × 10-7 cm-2 s-1, can be detected with a 5σ significance by observing it during 106 s at the level of the Cygnus background, and a source having intensity J (E γ ≥ 100 MeV) = 10-6 cm-2 s-1 can be detected to within a mean square positional accuracy of about 15'.

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