Balloon observations of the 5-100 MeV gamma rays from the Crab Nebula

Details Balloon observations of the 5-100 MeV gamma rays from the Crab Nebula Balloon observations of the 5-100 MeV gamma rays from the Crab Nebula

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pazh...10..104i&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 10, Feb. 1984, p. 104-110) Soviet Astronomy Letters (ISSN 0360-0327), vol. 10, Jan.-Feb

Astronomy and Astrophysics

Astronomy

Astronomical Spectroscopy, Balloon-Borne Instruments, Crab Nebula, Gamma Ray Astronomy, Emission Spectra, Gamma Ray Telescopes, Radiant Flux Density

Scientific paper

Gamma-ray observations of the Crab Nebula, obtained with the Natalya-1 balloon-borne gamma-ray telescope over India on Nov. 6-7, 1980, are reported. The instrument comprises 18 wire spark chambers separated by lead converter layers and divided into three sections, anticoincidence scintillation counters, a directional Cerenkov counter, and standard photomultiplier tubes, and covers the range from 5 to 100 MeV; the data-analysis procedures are described in detail. A total of 3700 events are analyzed, and the differential intensities at 5-20 and 20-100 MeV are found to be (21 + or - 3) x 10 to the -6th photon/sq cm s MeV and (1.0 + 0.1 or - 0.2) x 10 to the -6th photon/sq cm s MeV, respectively, corresponding to a spectral index of -2.2.

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