Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..704s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 2, Aug. 1992, p. 704-718.
Astronomy and Astrophysics
Astronomy
17
Radio Sources (Astronomy), Stellar Evolution, Supernova Remnants, Very Large Array (Vla), H Lines, Radio Astronomy, Recombination Reactions
Scientific paper
The VLA in its 36-cm configuration was used to observe 290 known compact galactic plane radio sources at 20 cm in order to identify very young SNRs. Supernova were detected with diameters between 5 and 20 arcsec. Compact structure was detected in 168 of the 290 sources; 73 sources were unresolved or slightly resolved point sources, 21 were single-well resolved, 56 were double, and 18 were triple or complex. The large-scale structure was completely resolved for 122 of the sources. Additional observations at 6 cm with the VLA in the 11-km configuration were made of 14 sources with apparent shell structures that might have been characteristic of young SNRs. Low-resolution observations were made at 20 cm of 62 fields where the source was completely resolved in the high-resolution images. One source, G25.5 + 0.2, is a possible very young SNR. New H66-alpha recombination line observations place severe constraints on any thermal interpretation for this object.
Cowan John J.
Ekers Ron D.
Goss William Miller
Roberts Daniel A.
Sramek Richard A.
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