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Stochastic Acceleration of Cosmic Rays in the Central Molecular Zone of the Galaxy

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arxiv 1110.3140 v1 pith:LV5CQJBR submitted 2011-10-14 astro-ph.HE

Stochastic Acceleration of Cosmic Rays in the Central Molecular Zone of the Galaxy

classification astro-ph.HE
keywords accelerationdiffusestochasticcosmicelectronsemissiongalaxygamma-ray
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Particle acceleration in the inner ~ 200 pc of the Galaxy is discussed, where diffuse TeV gamma-rays have been detected by the High Energy Stereoscopic System (HESS) observation. The diffuse gamma-ray emission has a strong correlation with molecular clouds with large velocity dispersion, indicating the presence of turbulence. It is argued that the turbulence may contribute to the acceleration of cosmic rays via stochastic acceleration. The stochastic acceleration may energize cosmic-ray protons up to ~ 100 TeV and electrons to ~ 1 TeV in a relatively tenuous medium. The difference in the efficiency between protons and electrons supports the hadronic scenario of the diffuse TeV gamma-ray emission.

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