![]() ![]() ![]() Cosmic-ray acceleration can be probed through observations of gamma-rays produced in inelastic proton-proton collisions, at GeV and TeV energies. Star-forming regions have been proposed as potential Galactic cosmic-ray accelerators for decades. The jet and arc clouds, whereas the TeV gamma-ray emission requires a Alternatively,Īn anisotropic supernova explosion which occurred ~Myr ago may be able to form The known microquasars have a Myr age or steady TeV gamma-rays. Microquasar with long-term activity may be able to offer a possible engine toįorm the jet and arc clouds and to produce the TeV gamma-rays, although none of With Westerlund 2 but are located at a greater distance around 7.5 kpc. We suggest that the jet and arc clouds are not physically linked correspond to the jet and arcĬlouds spatially better than the giant molecular clouds associated with ![]() The jet cloud, suggesting that some additional heating may be operating The multi CO transitions gives temperature as high as 20 K in a few places of Gives a constraint on the age of the jet cloud to be ~Myrs. A sign of star formation is found at the edge of the jet cloud and The arc cloud shows a crescent shape in the west of HESS In addition, we have found a new counter jet cloud The jet cloud shows a linear structure from the position We have made new CO observations of two molecular clouds, which we call "jet"Īnd "arc" clouds, toward the stellar cluster Westerlund 2 and the TeV gamma-ray ![]()
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