Cosmic Rays in Superbubbles

T. Tolksdorf

doi:10.3847/1538-4357/ab24c6

2019-07-08

DOI：10.3847/1538-4357/ab24c6

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摘要

En 中文

A solution of the transport equation for cosmic rays in turbulent magnetic fields in a spherically symmetric geometry is presented. The results are applied to particle propagation in superbubbles. In the fully analytical calculation, various energy-loss processes are considered. From the distribution function of the cosmic-ray particles, the distribution for pions from continuous losses is computed. Folding with the appropriate cross section yields the gamma-ray distribution. It is shown that in the case of efficient acceleration the volume-integrated pi(0)-decay gamma-ray emission from the superbubble exhibits the characteristic hard differential number density spectrum N (E-gamma) proportional to E-gamma(-0.29) at large gamma-ray energies, E-gamma >> 70 MeV. This prediction is useful for identifying efficient superbubble cosmic-ray accelerators from gamma-ray observations.

Keyword:

acceleration of particles

cosmic rays

gamma rays: ISM

ISM: bubbles

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期刊

Astrophysical Journal

IF:

5.4

论文数:

8.3W

被引数:

32.0W

机构

CEA

学者数:

3.5W

论文数: 2.3W

被引数: 62

ruhr university bochum

学者数:

2.3W

论文数: 1.9W

被引数: 14

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