A study of galactic supernova remnants, based on Molonglo-Parkes observational data

Details A study of galactic supernova remnants, based on Molonglo-Parkes observational data A study of galactic supernova remnants, based on Molonglo-Parkes observational data

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.174..267c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 174, Feb. 1976, p. 267-305.

Astronomy and Astrophysics

Astronomy

497

Astronomical Catalogs, Milky Way Galaxy, Stellar Luminosity, Supernova Remnants, Adiabatic Conditions, Brightness Discrimination, Magellanic Clouds, Radio Telescopes, Tables (Data)

Scientific paper

Observations with the Molonglo and Parkes radio telescopes have recently produced improved radio frequency data for the southern galactic supernova remnants (SNRs). These observations are used to investigate the general evolutionary properties of SNRs. Empirical relationships are derived which describe in general terms the expansion of SNRs, at least during the adiabatic phase of their evolution. An improved SNR distance scale is established, based largely on Parkes H I absorption measurements, and the resulting relationship between surface brightness and linear diameter for galactic SNRs is found to be compatible with that determined for the Magellanic Cloud SNRs, contrary to earlier conclusions. Completeness in the catalogue compiled down to a uniform level of surface brightness permits an improved estimate of the number of SNRs in the Galaxy and suggests that this number has previously been overestimated. A larger characteristic interval between supernova events of about 150 yr is inferred.

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