Compton telescope observations of gamma rays from SN 1987A

Details Compton telescope observations of gamma rays from SN 1987A Compton telescope observations of gamma rays from SN 1987A

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386..715a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 20, 1992, p. 715-719. Research supported by Ministry of Higher Ed

Astronomy and Astrophysics

Astronomy

4

Gamma Ray Astronomy, Power Spectra, Stellar Spectra, Supernova 1987A, Balloon-Borne Instruments, Gamma Ray Telescopes, Radiant Flux Density, Spectrum Analysis

Scientific paper

Results are reported of observations of a significant excess of gamma rays at energies of 1.0-2.5 MeV from the direction of SN 1987A, 418 days after detonation. Two features at 1.21 and 1.88 MeV are attributed to the 1.238 MeV and the combined 1.771, 2.015, and 2.035 MeV line emissions from the decay of Co-56 in the expanding ejecta with respective fluxes of (4.6 +/-1.4 +/-1.2) x 10 exp -4 and (3.5 +/-0.9 +/-0.9) x 10 exp -4 gamma/sq cm s, where the first error is statistical and the second systematic. The obtained energy resolution of 11 percent did not permit a definite separation of the 1.771-MeV line from the two other lines at 2.015 and 2.035 MeV that form the group at 1.88 MeV. The line fluxes were obtained after correcting for the north-south effect and the continuum.

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