The theory of gamma-ray emergence in supernova 1987A

Details The theory of gamma-ray emergence in supernova 1987A The theory of gamma-ray emergence in supernova 1987A

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.333..534p&link_type=abstract

Nature (ISSN 0028-0836), vol. 333, June 9, 1988, p. 534-537. NASA-supported research.

Computer Science

118

Gamma Ray Spectra, Stellar Models, Stellar Radiation, Supernova 1987A, Cobalt Isotopes, Compton Effect, Stellar Envelopes, Supernova Remnants

Scientific paper

Since June 1987 the authors have had little cause to doubt the presence of radioactivity in supernova 1987A. The decay of 56Co to 56Fe would give rise to detectable γ-ray line emission at 847 and 1,238 keV with a peak flux of 10-3photons cm-2s-1 about one year after the explosion. In August, both lines were detected, with a strength within a factor of two of 10-3photons cm-2s-1, but about six months earlier than predicted. The authors show that the early emergence of γ-rays can be accounted for in a "mixed" model, in which an approximately isotropic process destroys chemical segregation with respect to radial mass coordinate and velocity.

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