Computer Science
Scientific paper
Mar 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.221..847b&link_type=abstract
Nature, Volume 221, Issue 5183, pp. 847-848 (1969).
Computer Science
13
Scientific paper
MANY studies of the Crab have shown that it is exceedingly difficult to understand its evolution and its high-energy particle content on the assumption that all the energy was injected at the time of the outburst of the supernova about 103 yr ago. Evidence of continuous activity is provided directly by the moving wisps (private communication from W. Baade, a preprint by J. Scargle and ref. 1) and the suggestion that some parts of the flux of high-energy electrons responsible for the radio and optical synchrotron radiation have lifetimes which are short compared with the time which has elapsed since the explosion. If all the energy released in a supernova explosion is emitted during the outburst and if the high-energy particles were generated in this way2, the continuous activity would not be explained. But there are now a number of lines of evidence each of which suggests that condensed supernova remnants are present, and it is these which probably maintain the overall activity in the Crab. We outline the arguments which lead to this conclusion.
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