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Cosmic Rays in the Inner Galaxy and the Diffusion Properties of the Interstellar Medium
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Cosmic Rays in the Inner Galaxy and the Diffusion Properties of the Interstellar Medium
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Recent measurements of cosmic gamma ray intensities up to TeV energies have been used to estimate the spectral shape of the parent cosmic ray particles present in the interstellar medium. The case is made for the particle spectrum in the Inner Galaxy being flatter than locally and in the Outer Galaxy. Of various possible explanations we make the case for the propagation of the particles being different in the more turbulent interstellar medium of the Inner Galaxy. The characteristic parameter alpha for the so called anomalous diffusion is expected to be less in the Inner Galaxy than that locally and the corresponding power law spectral exponent of the cosmic ray particles gamma will differ from that locally. Arguments are presented favouring a value of alpha lower than the local one by about Delta alpha = 0.2, the consequence is that Delta gamma = 0.1 for the parent particles.
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Cited by 1 Pith paper
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Superdiffusion of cosmic rays in the vicinity of their accelerators and the resulting $\gamma$-ray emission
Superdiffusion produces constant or r^{α-3} CR radial profiles near sources; the associated γ-ray morphology can distinguish it from normal diffusion with IACTs.
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