Numerical studies on the structure of the cosmic ray electron halo in starburst galaxies

Details Numerical studies on the structure of the cosmic ray electron halo in starburst galaxies Numerical studies on the structure of the cosmic ray electron halo in starburst galaxies

2006-10-26

arxiv.org/abs/astro-ph/0610776v1

Astrophys.SpaceSci.309:151-155,2007

Astronomy and Astrophysics

Astrophysics

4 pages, 6 figures, to appear in Proceeding of the conference "The multi messenger approach to high energy gamma ray sources",

Scientific paper

10.1007/s10509-007-9450-7

The structure of the cosmic ray electron halo of a starburst galaxy depends strongly on the nature of galactic wind and the configuration of the magnetic field. We have investigated these dependencies by solving numerically the propagation of electrons originating in starburst galaxies, most likely in supernova remnants. The calculations are made for several models for the galactic winds and for the configuration of the magnetic fields for comparison with observations. Our simulation of a quasi-radio halo reproduces both the extended structure of ~ 9 kpc and the subtle hollow structure near the polar region of the radio halo that are observed in the starburst galaxy NGC 253. These findings suggest the existence of strong galactic wind in NGC 253.

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