Magnetic field amplification in CDM anisotropic collapse

Details Magnetic field amplification in CDM anisotropic collapse Magnetic field amplification in CDM anisotropic collapse

2002-08-06

arxiv.org/abs/astro-ph/0208126v2

Mon.Not.Roy.Astron.Soc. 338 (2003) 785

Astronomy and Astrophysics

Astrophysics

small changes, including estimates in agreement with numerical results; version accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06095.x

We use the Zel'dovich approximation to analyse the amplification of magnetic fields in gravitational collapse of cold dark matter during the mildly nonlinear regime, and identify two key features. First, the anisotropy of collapse effectively eliminates one of the magnetic components, confining the field in the pancake plane. Second, in agreement with recent numerical simulations, we find that the shear anisotropy can amplify the magnetic field well beyond the isotropic case. Our results suggest that the magnetic strengths observed in spiral and disk galaxies today might have originated from seeds considerably weaker than previous estimates.

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