New limits on the generation of magnetic field

Details New limits on the generation of magnetic field New limits on the generation of magnetic field

2003-11-30

arxiv.org/abs/astro-ph/0312016v1

Mon.Not.Roy.Astron.Soc. 350 (2004) 761

Astronomy and Astrophysics

Astrophysics

4 pages, submitted to MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07694.x

Magnetic fields are generated in ionized objects rotating with respect to a radiation background. Based on conservation of canonical ion momentum, it has been previously suggested that even if the radiation intensity is unrestricted the maximum field strength generated this way is ~(10^{-4}\Omega) Gauss, where \Omega is the initial angular velocity of the object. We show that this limit is valid only for an object made of fully ionized and optically thin plasma. The limit can be relaxed by orders of magnitude in the presence of a high neutral fraction or if the plasma is coupled to other forms of matter such as stars or compact clouds.

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