Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000immm.proc..179d&link_type=abstract
The interstellar medium in M31 and M33. Proceedings 232. WE-Heraeus Seminar, 22-25 May 2000, Bad Honnef, Germany. Edited by El
Physics
2
Scientific paper
There are over 300 known SNRs in M31 and M33. Such an extensive data set of SNRs has the potential to address many important problems relating to the evolution of SNRs and their interaction with the interstellar media (ISM) of M31 and M33. The focus of this paper is the relationship between the SNRs and the production of cosmic rays (CRs). The theory predicting that SNRs are the source of most CRs has been tested on four fronts. It is shown that the CR particle yield of a typical observed SNR in M33 is in the range of 1%-10%. It is also shown qualitatively that the yield increases with increasing ambient gas density. The SNR population of M33 is found to contain between 0.1% and 1% of all relativistic particles in M33 which leads to an estimate of the CR residence time of 2 x 106 - 2 x 107 years. The spectral index distribution of the SNRs peaks near α = 0.6 indicating that the CR electrons in SNRs follow a power law energy distribution with an index, γ = 2.2+/-0.4. All four results support the hypothesis that SNRs are the source of most CRs in the disk of M33.
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