And still there is no pulsar
Article Abstract:
The explosion of supernova SN1987A on Feb 23, 1987 was believed to presage the formation of a pulsar, but no evidence of a pulsing neutron star has been observed. Some, but not all, of the present luminosity of SN1987A results from decay of radioactive cobalt. The excess apparently does not result from a neutron star but from physical processes following the explosion. An observed 10-second neutrino pulse at the time of explosion indicates that a neutron star was formed. It is possible that there is no evidence of it after then because a black hole formed when the star collapsed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Puritans and cavaliers
Article Abstract:
The hypothesis that gamma-ray bursts are produced by neutrons stars inside the Milky Way Galaxy got a boost from Hui Li and Charles D. Dermer's analysis of data showing that such bursts are spread isotropically through space. This analysis linked the bursts to newly spotted groups of high-velocity radio pulsars, which are young neutron stars with powerful magnetic fields. However, an alternative hypothesis maintains that the bursts derive from outside the Galaxy. Further research is required to settle which of these hypotheses is correct.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
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