The supernova remnant G54.5 - 0.3 and its environs

Details The supernova remnant G54.5 - 0.3 and its environs The supernova remnant G54.5 - 0.3 and its environs

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1224c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, July 1985, p. 1224-1230.

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15

Galactic Radio Waves, Supernova Remnants, Ultrahigh Frequencies, Astronomical Maps, Brightness Distribution, H Ii Regions, Hydrogen, Ring Structures

Scientific paper

A 2-deg field in the galactic plane near longitude 54° has been mapped at 1.4 GHz using the Penticton synthesis telescope. The supernova remnant G54.5-0.3 is seen as a prominent shell structure with diameter 41 arcmin, well resolved with the beamsize of 2.6×1.3 arcmin. A second ring-like structure in the field, once proposed as another supernova remnant, is now shown to be thermal. The complex field also contains: (1) several other extended sources, most of them unrelated H II regions spread over a large distance ranging up to 11 kpc, (2) many extragalactic sources of small diameter and quite steep spectral index, and (3) an elongated structure subtending nearly 0°.5 that may be an obscured giant radio galaxy.

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