Cosmic rays in the inner galaxy and the diffusion properties of the interstellar medium

被引：18

作者：

Erlykin, A. D. ^{[1
,2
]}

Wolfendale, A. W. ^{[2
]}

机构：

[1] PN Lebedev Phys Inst, Moscow 117924, Russia

[2] Univ Durham, Dept Phys, Durham, England

来源：

ASTROPARTICLE PHYSICS | 2013年 / 42卷

关键词：

Inner Galaxy; Turbulence; Cosmic rays; Energy spectrum; GALACTIC GAMMA-RAYS; ANOMALOUS DIFFUSION; SUPERNOVA-REMNANTS; RADIATION; ORIGIN; EMISSION; ELECTRONS; SPECTRA;

D O I：

10.1016/j.astropartphys.2012.12.003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 a lower than the local one by Delta alpha=0.2; the consequence is that Delta gamma similar to 0.1 for the parent particles. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：70 / 75

页数：6

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