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Title:
Unusual radio arcs discovered in the radio source G318.9 + 0.4
Authors:
Whiteoak, J. B. Z.
Affiliation:
AA(Sydney, University, Australia)
Publication:
Nature (ISSN 0028-0836), vol. 347, Sept. 13, 1990, p. 157, 158. (Nature Homepage)
Publication Date:
09/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
RADIATION DISTRIBUTION, RADIO SOURCES (ASTRONOMY), SUPERNOVA REMNANTS, NEBULAE, PULSARS, SKY SURVEYS (ASTRONOMY)
DOI:
10.1038/347157a0
Bibliographic Code:
1990Natur.347..157W

Abstract

Observations of the radio source G318.9 + 0.4, tentatively identified as an SNR, are reported which reveal a remarkable network of arcs in the object which exclude it from any of the standard classes of SNRs. The arcs outline an approximately elliptical region enclosing a bright off-center core component which has several curved extensions. Although the appearance of the arc is unprecedented, G318.9 + 0.4 might belong to a recently proposed class of nonthermal axisymmetric radio sources unrelated to SNRs. Alternatively, the core component may indeed be an SNR, excited by the stellar remnant of the SN event, with the arc emission arising through jet activity.
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