A search for young Galactic supernova remnants

A sample of eight small-diameter radio sources has been selected from the Molonglo Galactic Plane Survey (MGPS) as candidates for young Galactic supernova remnants. The sources have been identified in the IRAS and Midcourse Space Experiment infrared data bases and imaged in the H107α radio recombina...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2002-09, Vol.335 (1), p.114-124
Main Authors: Misanovic, Zdenka, Cram, Lawrence, Green, Anne
Format: Article
Language:English
Subjects:
H ii regions
radio lines: ISM
supernova remnants
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Summary:A sample of eight small-diameter radio sources has been selected from the Molonglo Galactic Plane Survey (MGPS) as candidates for young Galactic supernova remnants. The sources have been identified in the IRAS and Midcourse Space Experiment infrared data bases and imaged in the H107α radio recombination line (RRL) using the Australia Telescope Compact Array (ATCA). Seven of the sources display high ratios of infrared-to-radio-continuum flux density and/or detectable RRLs and are almost certainly H ii regions. One source (G282.8−1.2) is identified as a possible new young Galactic supernova remnant, based on its relatively weak infrared emission, steep radio spectrum, and possible X-ray emission. The adopted method for distinguishing thermal and non-thermal Galactic radio sources seems promising and could be fruitfully applied to more than 100 small-diameter sources listed in the MGPS.
ISSN:0035-8711
1365-2966
DOI:10.1046/j.1365-8711.2002.05602.x