Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..187g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. 187-197. Research supported by NSF.
Astronomy and Astrophysics
Astronomy
9
Infrared Astronomy, Radio Astronomy, Sky Surveys (Astronomy), Supernova Remnants, Brightness Distribution, H Ii Regions, Polarized Radiation
Scientific paper
In this paper, it is shown that more than half of the SNR candidates from the first Galactic quadrant in the Clark Lake 30.9 MHz survey show independent evidence of being associated with SNRs. In most cases, these appear to be low surface brightness SNRs which have escaped detection in the past. About a fifth of the candidates should be strongly considered for classification as new SNRs, and a third of these are also probable IR sources, consistent with the detected fraction of known Galactic SNRs seen in a recent IR survey. Two of the confirmed candidates share the characteristic of appearing considerably larger at 30.9 MHz than they do at centimeter or optical wavelengths. This characteristic suggests the possibility of extended, low surface brightness emission that may extend considerably beyond the nominal boundaries of some SNRs.
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