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Title:
G0.9 + 0.1 and the emerging class of composite supernova remnants
Authors:
Helfand, D. J.; Becker, R. H.
Affiliation:
AA(Columbia University, New York), AB(California, University, Davis and Livermore)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 203-214. (ApJ Homepage)
Publication Date:
03/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
NEBULAE, NEUTRON STARS, PULSARS, RADIO SOURCES (ASTRONOMY), SUPERNOVA REMNANTS, OPTICAL PROPERTIES, POLARIMETRY, RADIANT FLUX DENSITY, RADIO ASTRONOMY
DOI:
10.1086/165050
Bibliographic Code:
1987ApJ...314..203H

Abstract

High-resolution, multifrequency maps of a bright extended radio source near the Galactic center have revealed it to be a classic example of a composite supernova remnant. A steep-spectrum shell of emission, about 8 arcmin in diameter, surrounds a flat-spectrum, highly polarized Crab-like core about 2 arcmin across. The two components have equal flux densities at about 6 cm, marking this source as having the highest core-to-shell ratio among the about 10 composite remnants identified to date. X-ray and far-infrared data on the source are used to constrain the energetics and evolutionary state of the remnant and its putative central pulsar. It is argued that the total energy contained in the Crab-like components requires that the pulsars powering them were all born with periods shorter than 50 ms, and that if a substantial number of neutron stars with slow initial rotation rates exist, their birthplaces have not yet been found.

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