Observation of gamma radiation from crab nebula in 5-100 MeV range

Details Observation of gamma radiation from crab nebula in 5-100 MeV range Observation of gamma radiation from crab nebula in 5-100 MeV range

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rpspr...2...71i&link_type=abstract

In its USSR Rept.: Space (JPRS-USP-84-005) p 71 (SEE N85-11060 02-12) Transl. into ENGLISH from Pisma V Astron. Z. (Moscow),

Astronomy and Astrophysics

Astronomy

Crab Nebula, Gamma Rays, Charged Particles, Coordinates, Gamma Ray Telescopes, Scattering, Spaceborne Telescopes

Scientific paper

Results are presented from observations of gamma radiation from the Crab Nebula within the energy range 5-100 MeV, conducted 6-7 November 1980 using a Nataliya-1 gamma telescope in aerostat flight. The structural layout of the telescope is shown and the observation procedure is described. The observations were carried out at latitude 8 N (Hyderabad city, India) over 6-hour periods. A total of 3,700 events were registered. Data were processed in two stages: classification of events (pairs, singlets, background) and determination of track; and a determination of energy for each useful event from the value for repeat scattering of secondary charged particles and the direction of gamma quanta. Events were assigned to one of two energy ranges, viz. 5-20 MeV and 20-100 MeV. Differential fluxes were determined using parallel coordinates and a cross-correlational procedure. Differential gamma fluxes were as follows: I gamma (5-20 Mev) = 2.1 plus or minus 0.3). -100,000 gamma/square centimeters s:MeV I gamma (20-100 Mev) = 1.0 plus or minus 0.1 over 0.2). - 1,000,000 gamma/square centimeters s:MeV. Results agree quite well with earlier published findings and do not support the idea of significant excess in the range 5-20 MeV.

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