The Radial Distribution of SNRs in nearby Galaxies

Details The Radial Distribution of SNRs in nearby Galaxies The Radial Distribution of SNRs in nearby Galaxies

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.2639s&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

1

Scientific paper

Since supernova remnants (SNRs) are believed to be the primary energy sources of the interstellar medium in general and of Galactic cosmic rays (CRs) in particular, their distribution in galaxies is an important basis for modelling the distribution of the CRs and their γ -ray spectrum. We analyzed the radial surface density of X-ray and radio selected SNRs in the Large Magellanic Cloud (LMC), M 33, M 31, and NGC 6946. In each of the galaxies, the surface densities of the X-ray and radio SNRs are in excellent agreement, showing an exponential decay in radius. The radial scale length of the distribution is 1 - 1 of the radius of the 4 3 galaxies, fully consistent with values derived for the Milky Way. Therefore, not only the radio SNRs, but also the X-ray detected SNR sample can be interpreted to be representative for the CR sources within a star forming galaxy.

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