Biermann Battery Powered by Resistive Heating Induced by Cosmic Ray Streaming

Abstract

It is recently proposed that cosmic rays generate a seed magnetic field in the early universe. In this paper, we propose another generation mechanism of magnetic fields by cosmic rays, which is the Biermann battery driven by resistive heating induced by the streaming of cosmic rays. This mechanism is dominant in small-scale, low-temperature, and strongly-ionized regions, compared with other previously proposed mechanisms. Because cosmic rays are expected to be accelerated after the death of the first stars, this mechanism can work during structure formation in the early universe. We show that it makes the seed magnetic field with sufficient strength for the subsequent dynamo to amplify it to the micro Gauss level in the current galaxies.

arXiv comment6 pages, 2 figures, accepted for publication in MNRAS

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Cited by in corpus (2)

• Signatures of Cosmic Ray Heating in 21-cm Observables
• Resistive Heating Induced by Streaming Cosmic Rays Around a Galaxy in the Early Universe