Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1003a&link_type=abstract
Astronomical Journal, vol. 86, July 1981, p. 1003-1009.
Astronomy and Astrophysics
Astronomy
8
Radio Sources (Astronomy), Supernova Remnants, Extragalactic Radio Sources, High Resolution, Radiant Flux Density
Scientific paper
High-resolution 430-MHz (69.8 cm) continuum observations of the galactic supernova remnant S 147 are presented. The presence of embedded numerous small-diameter radio sources producing a well defined radio shell, and a pronounced break in the flux density spectrum are suggested. Four 4C sources, several B2 sources and three anonymous sources are included, and the mean spectral index of these sources is found to be significantly less than that of typical extragalactic sources. Due to the distribution of the angular diameters, it is also suggested that the sources belong to the galactic sources, although the numbers do not represent an excess over that expected from background source counts. It is concluded that S 147 is in a relatively late stage of remnant evolution, and the sources may be a result of ionization of neutral material by the advancing shock.
Angerhofer P. E.
Kundu Mukul R.
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