Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..819h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, June 1984, p. 819-823.
Astronomy and Astrophysics
Astronomy
16
Milky Way Galaxy, Radio Sources (Astronomy), Supernova Remnants, Astronomical Catalogs, Astronomical Maps, Morphology, Polarization Characteristics
Scientific paper
In a search for Crab-like supernova remnants in the Galaxy, 19 compact (<1arcmin.5) radio sources were observed with the VLA. Only the previously known supernova remnant (SNR) G21.5-0.9 has both a centrally peaked brightness distribution and integrated polarization greater than 5%, properties characteristic of Crab-like remnants. The remaining objects are either compact H II regions or extragalactic sources. The authors use these results to set a limit of ⪉5 on the number of undiscovered Crab-like SNR which exist in the Galaxy above a 6-cm flux density of 1 Jy. The implication of this result for the formation rate of galactic Crab-like remnants is discussed.
Becker Robert H.
Chance Damien
Helfand David J.
White Richard L.
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