Measurements of gamma-ray line profiles from SN1987A and the structure of the ejecta

Astronomy and Astrophysics – Astrophysics

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Gamma Ray Spectra, Line Spectra, Stellar Mass Ejection, Stellar Structure, Supernova 1987A, Balloon-Borne Instruments, Cobalt Isotopes, Gamma Ray Spectrometers, Infrared Spectra, Radioactive Isotopes

Scientific paper

A few balloon-borne-instrument measurements of SN1987A's gamma-ray line profiles furnish the most direct indication of the distribution of freshly synthesized Co-56 radioactive material in the SN ejecta. Most of these profiles exhibit line shapes inconsistent with the standard, spherically symmetric and homogeneously mixed models, and are very similar to line profiles for IR lines of Fe observed prior to day 500 of the SN. The consistency of the line profile from IR to gamma-ray energies may reflect the distribution of freshly synthesized material in the expanding SN shell.

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