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We report the detection of gamma-ray emission coincident with three supernovaremnants (SNRs) using data from the Large Area Telescope on board the FermiGamma-ray Space Telescope. W41, MSH 17-39, and G337.0-0.1 are SNRs known to beinteracting with molecular clouds, as evidenced by observations of hydroxyl(OH) maser emission at 1720 MHz in their directions and other observationalinformation. SNR shocks are expected to be sites of cosmic ray acceleration,and clouds of dense material can provide effective targets for production ofgamma-rays from neutral pion-decay. The observations reveal unresolved sourcesin the direction of G337.0-0.1, and MSH 17-39, and an extended sourcecoincident with W41. We model their broadband emission (radio to gamma-ray)using a simple one-zone model, and after considering scenarios in which theMeV-TeV sources originate from either neutral pion-decay or leptonic emission,we conclude that the gamma-rays are most likely produced through the hadronicchannel.

Fermi LAT Observations of Supernova Remnants Interacting with Molecular Clouds: W41, MSH 17-39, and G337.0-0.1