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Cosmic Rays in the Inner Galaxy and the Diffusion Properties of the Interstellar Medium

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arxiv 1212.2760 v1 pith:DOTHMZGR submitted 2012-12-12 astro-ph.GA astro-ph.HE

Cosmic Rays in the Inner Galaxy and the Diffusion Properties of the Interstellar Medium

classification astro-ph.GA astro-ph.HE
keywords galaxycosmicinnerparticlesalphagammainterstellarlocally
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Superdiffusion of cosmic rays in the vicinity of their accelerators and the resulting $\gamma$-ray emission

    astro-ph.HE 2026-07 conditional novelty 5.5

    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.