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Title:
A radio-emitting X-ray "bullet" ejected by the Vela supernova
Authors:
Strom, Richard; Johnston, Helen M.; Verbunt, Frank; Aschenbach, Bernd
Publication:
Nature, Volume 373, Issue 6515, pp. 590-592 (1995). (Nature Homepage)
Publication Date:
02/1995
Origin:
NATURE
DOI:
10.1038/373590a0
Bibliographic Code:
1995Natur.373..590S

Abstract

A MASSIVE star that explodes as a supernova produces an expanding remnant-a shell of gas-and leaves behind a neutron star. It has been suggested that instabilities during these explosions may create high-density clumps of ejecta1,2, but such fragments have never been found in a remnant containing a pulsar. Here we present X-ray and radio observations of a feature outside the shock-wave boundary of the Vela supernova remnant (associated with the pulsar PSR0833 - 45), which appears to be an ejected fragment, with a wake3. The feature, which has travelled nearly 50 pc from the site of PSR0833 - 45 but is only one parsec across, is a clear-cut case of a bullet of ejecta moving supersonically through the surrounding medium. The radio observations show non-thermal emission along the leading edge of the X-ray feature, indicating particle acceleration at the fragment's shock front.
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