High-velocity clump of Ni-56 in the SN 1987A envelope and the early emergence of gamma rays

Details High-velocity clump of Ni-56 in the SN 1987A envelope and the early emergence of gamma rays High-velocity clump of Ni-56 in the SN 1987A envelope and the early emergence of gamma rays

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sval...18...50c&link_type=abstract

Soviet Astronomy Letters, Vol. 18, p. 50, translation of Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 18, no. 2, Feb

Astronomy and Astrophysics

Astronomy

5

Gamma Rays, Nickel Isotopes, Stellar Envelopes, Supernova 1987A, Emission Spectra, Line Spectra, Shock Waves

Scientific paper

A high-velocity clump of Ni-56, whose existence was assumed as the explanation for the red emission satellite in the hydrogen lines of SN 1987A, is identified with the iron clump responsible for the small emission peak in the red wing of Fe II lines of 26 and 18 microns observed on day 408. The clump's parameters (0.002 solar mass, impact parameter of about 4500 km/s, and radial velocity of about +4000 km/s) dispel virtually all doubts that this clump results in the early (less than about 200 d) emission of SN 1987A in the gamma-ray lines of (Co-56)-(Fe-56) decay.

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