The gamma-ray light curves of SN 1987A

Details The gamma-ray light curves of SN 1987A The gamma-ray light curves of SN 1987A

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..638l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 10, 1990, p. 638-648.

Astronomy and Astrophysics

Astronomy

50

Cobalt Isotopes, Gamma Ray Spectra, Light Curve, Radioactive Isotopes, Supernova 1987A, Gamma Ray Astronomy, Line Spectra, Magellanic Clouds, Optical Thickness, Solar Maximum Mission

Scientific paper

Observations of the SN 1987A ejecta in four Co-56-decay gamma-ray lines, obtained using the SMM gamma-ray spectrometer between February 1987 and May 1989, are reported and analyzed. The instrument characteristics and data-reduction procedures are described, and the results are presented in extensive tables and graphs and discussed with reference to theoretical models. Gamma-ray fluxes significantly above possible instrumental levels (as determined from analysis of pre-1987 data) were detected in the second half of 1987 and the first half of 1988. The data are found to favor a model with some Co-56 in regions of low gamma-ray optical depth by 200 d after the SN outburst over models with all Co-56 at one depth within a uniform expanding envelope. Also investigated are the gamma-ray contribution to the total bolometric luminosity and the escape (and potential observability) of Co-57 gamma rays.

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