The radio structure of four supernova remnants

Details The radio structure of four supernova remnants The radio structure of four supernova remnants

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....53..237s&link_type=abstract

Astronomy and Astrophysics, vol. 53, no. 2, Dec. 1976, p. 237-241.

Astronomy and Astrophysics

Astronomy

4

Galactic Radiation, Radio Sources (Astronomy), Radio Spectra, Supernova Remnants, Astronomical Models, Astronomical Spectroscopy, Crab Nebula, Shells (Structural Forms), Stellar Structure

Scientific paper

Results are reported for 21-cm observations of four supernova remnants: G 11.2-0.3, G 29.7-0.2, G 39.2-0.3, and G 41.1-0.3. The measured flux densities are given with an estimated uncertainty of 5%, and the problem of determining source structure when observing shell-type sources with elliptical beams is discussed. The spectra of all four SNRs are found to be considerably steeper than those of the Crab Nebula and other 'Crab-like' remnants. The angular diameters, distances, linear diameters, distances from the galactic plane, and ages of the four SNRs are determined. It is concluded that G 11.2-0.3 has a well-formed shell structure and that the other three have at least partial shells. The comparatively steep spectra of these sources are shown to be consistent with the distinction between 'shell-like' and 'Crab-like' SNRs, which suggests that different physical processes operate in the two types.

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