Medium size radio continuum loops and their association with HI shells

Details Medium size radio continuum loops and their association with HI shells Medium size radio continuum loops and their association with HI shells

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...53...57s&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 53, July 1983, p. 57-65, 67-70.

Astronomy and Astrophysics

Astronomy

6

Interstellar Gas, Radio Astronomy, Supernova Remnants, Background Radiation, Milky Way Galaxy, Radio Emission

Scientific paper

An attempt is made to find very old SNRs, which may be hidden in the complex background radio emission of the Galaxy, by means of radio continuum survey data at 408 and 820 MHz. Structures of scale sizes smaller than 4 deg are obtained by a method for the subtraction of large scale background structures, and many loop-like features are found. Among these, five loops of 3-10 deg diameters are found to be associated with HI shells. It is suggested that these may be extremely old SNRs, of about one million years, at distances of less than about 1 kpc from the sun.

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