Properties of supernova remnants at known distances. II - The effect of ambient density on number-diameter relations

Astronomy and Astrophysics – Astrophysics

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Stellar Structure, Supernova Remnants, Diameters, Kinetic Energy

Scientific paper

The diameter distributions of SNRs at known distances were statistically analysed. The observed exponent of about +1 of the cumulative N - D relations could result from a random distribution of diameters. Such a distribution may be largely ascribed to variations in the ambient density. The diameters were corrected for variations in the ambient density (using the results of Paper I) and the resulting cumulative N - D relations then have exponents considerably larger than +1. However, the statistical significance of these exponents does not yet permit definite conclusions on the average expansion law of SNRs.

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