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Astron. Astrophys. 345, 256-258 (1999)

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Supernova remnants in molecular clouds: on cosmic ray electron spectra

M. Ostrowski

Obserwatorium Astronomiczne, Uniwersytet Jagielloski, ul. Orla 171, PL-30-2441 Kraków, Poland

Received 20 October 1998 / Accepted 18 December 1998


The particle acceleration process at a shock wave, in the presence of the second-order Fermi acceleration in the turbulent medium near the shock, is discussed as an alternative explanation for the observed flat synchrotron spectra of supernova remnants (SNRs) in molecular clouds. We argue that medium Alfvén Mach number shocks considered by Chevalier (1999) for such SNRs can naturally lead to the observed spectral indices.

Key words: acceleration of particles – shock waves – ISM: cosmic rays – ISM: supernova remnants

Send offprint requests to: mio@oa.uj.edu.pl

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© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999