Gamma-ray observations of Co-56 in SN 1987A

Astronomy and Astrophysics – Astronomy

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Cobalt Isotopes, Gamma Ray Astronomy, Supernova 1987A, Balloon Flight, Gamma Ray Spectrometers, Line Spectra, Supernova Remnants

Scientific paper

During observations of SN 1987A 286 days after the supernova explosion using a JPL high-resolution gamma-ray spectrometer, a line feature was found in the net supernova spectrum at an energy of 1240.8 + or - 1.7 keV, with an intrinsic width of 8.2 + or - 3.4 keV FWHM, and a net flux of 0.0021 + or - 0.0007 photons/sq cm per s. This feature is interpreted as the 1238 keV line from the decay of Co-56 in the supernova remnant. The blueshift and intrinsic broadening of the 1238 keV line are consistent with models incorporating mixing of the radioactive cobalt in the expanding eject.

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