Radio observations of small diameter sources in the field of the supernova remnant S147

Astronomy and Astrophysics – Astronomy

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Radio Sources (Astronomy), Supernova Remnants, Astronomical Maps, Radiant Flux Density, Radio Spectra

Scientific paper

Radio flux data have been obtained at frequencies between 2.7 and 10.7 GHz for a large number of sources in the field of the supernova remnant S147. The appearance of these sources is in general pointlike for the highest available angular resolution. The spectral indices differ from source to source and are comparable to those usually observed for extragalactic sources. An exception are probably 0531+275 and 0531+279. The integrated spectrum of these neighboring sources can be extended to 178 MHz and shows a break near 1 GHz similar to the break in the spectrum of the SNR. The distribution of the spectral indices of the sources with respect to their location on the shell is shown; the map suffers a selection effect. Although the amazing arrangement of the sources on a circle following the SNR shell suggests that some at least are associated, this idea is not supported convincingly by the spectra.

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