New radio observations of two supernova remnants in Cassiopeia - G 126.2 + 1.6 and G 127.1 + 0.5

Details New radio observations of two supernova remnants in Cassiopeia - G 126.2 + 1.6 and G 127.1 + 0.5 New radio observations of two supernova remnants in Cassiopeia - G 126.2 + 1.6 and G 127.1 + 0.5

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..303j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 303-307. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

16

Cassiopeia Constellation, Interstellar Matter, Radio Sources (Astronomy), Supernova Remnants, Astronomical Maps, Continuous Spectra, Point Sources, Radiant Flux Density, Radio Telescopes

Scientific paper

New radio observations of the supernova remnants G 126.2 + 1.6 and G 127.1 + 0.5 at 408 MHz and of the latter at 1420 MHz are presented. The maps, which combine synthesis and single-antenna observations, are complete in extended structure. G 126.2 + 1.6 has a low mean surface brightness of 3.3 10 to the -22nd W/sq m Hz sr at 408 MHz, fragmented emission, and a spectral index near 0.6 in the range 0.4-3.0 GHz. G 127.1 + 0.5; a supposedly younger remnant some three times brighter, has a mean spectral index near 0.45 in the range of 0.4-5 GHz. Comparisons of the maps at 408 MHz and 1420 MHz give tentative support for the detection at higher frequencies (Fuerst et al., 1984) of a slightly steeper spectrum for emission from the southern shell than for emission from the northern shell. The difficulties associated with distance determinations for the remnants are discussed.

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