Statistics of large diameter radio SNRs.

Details Statistics of large diameter radio SNRs. Statistics of large diameter radio SNRs.

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..398a&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

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Scientific paper

Radio data on the very large diameter Supernova Remnants (SNRs) give direct information on the structure of the ISM. It is developed the model of evolution of shell-type radio SNRs which is based on the assumption that the mechanism of diffusive shock acceleration is the main generator of the radio emitting electrons. According to the model SNRs evolve with constant surface brightness up to the some maximum diameter after which the radio luminosity of the remnant abruptly drops. In low density environments it predicts an existence of very large diameter relatively bright radio SNRs. The maximum size of them is determined by the energy of SN explosion and total pressure of the interstellar matter. In particular, hupernova events can leave after themselves radio remnants with diameter larger than 200 pc. Due to low surface brightness of large diameter SNRs and inhomogeneity of the background radio emission it is difficult to investigate such objects observationaly in our Galaxy but they can be detected in nearby galaxies. The statistics of such remnants is investigated.

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