Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21534202h&link_type=abstract
American Astronomical Society, AAS Meeting #215, #342.02; Bulletin of the American Astronomical Society, Vol. 42, p.447
Astronomy and Astrophysics
Astronomy
Scientific paper
Supernova remnants (SNRs) interacting with molecular clouds are potentially exciting systems in which to detect evidence of cosmic ray acceleration. Large reservoirs of dense gas may act as a target for cosmic rays accelerated by the SNR, producing prominent gamma-ray emission at GeV and TeV energies. In many SNRs coincident with gamma-ray sources, the presence of OH(1720 MHz) masers is used to identify interaction with dense gas and to provide a kinematic distance to the system. A clear correlation exists between these SNR masers and gamma-ray sources. Sensitive Very Large Array and Green Bank Telescope observations show extended maser emission tracing the shock interaction. The observed high columns of hydroxyl require non-equilibrium chemistry in the post-shock gas, which can be explained by a high ionization rate. If the associated gamma-ray emission arises from hadronic cosmic rays local to the remnant, the gamma-ray luminosity provides a direct estimate of the local cosmic ray density. Fermi LAT observations of SNRs with masers provide evidence that the cosmic ray ionization rate is enhanced by up to one to two orders of magnitude over the local solar value. This may explain the observed correlation between SNR masers and gamma-ray sources.
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