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Supernova remnants in molecular clouds: on cosmic ray electron spectra
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
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Online publication: April 12, 1999