Galaxy formation and cosmic-ray acceleration in a magnetized universe

Details Galaxy formation and cosmic-ray acceleration in a magnetized universe Galaxy formation and cosmic-ray acceleration in a magnetized universe

2005-06-29

arxiv.org/abs/astro-ph/0506742v1

Astrophys.J.629:L9-L12,2005

Astronomy and Astrophysics

Astrophysics

10 pages, ApJL in press

Scientific paper

10.1086/444351

We study the linear magneto-hydrodynamical behaviour of a Newtonian cosmology with a viscous magnetized fluid of finite conductivity and generalise the Jeans instability criterion. The presence of the field favors the anisotropic collapse of the fluid, which in turn leads to further magnetic amplification and to an enhanced current-sheet formation in the plane normal to the ambient magnetic field. When the currents exceed a certain threshold, the resulting electrostatic turbulence can dramatically amplify the resistivity of the medium (anomalous resistivity). This could trigger strong electric fields and subsequently the acceleration of ultra-high energy cosmic rays (UHECRs) during the formation of protogalactic structures.

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