Volume 393, Number 2, October II 2002
|Page(s)||685 - 691|
|Published online||23 September 2002|
Generation of magnetic seed fields in self-gravitating protogalactic clouds
Institute for Astronomy and Astrophysics, University of Munich, Germany
2 Centre of Interdisciplinary Plasma Science, Garching, Germany
3 Max-Planck-Institut für extraterrestrische Physik, Garching, Germany
Corresponding author: G. T. Birk, email@example.com
Accepted: 11 July 2002
The seed magnetization of protogalaxies can be provided by relative shear flows and collisional friction of the ionized and the neutral fluid components in partially ionized self-gravitating and rotating protogalactic clouds. The gravitational potential of a collapsing protogalactic cloud is the ultimate energy source that partly is converted to magnetic fields and the associated electric currents by collisional momentum transfer in the partially ionized systems. Self-consistent plasma-neutral gas simulations, that take into account self-gravitation, show that magnetic fields of the order of some 10-14 G are generated on spatial scales of some 100 pc in about years.
Key words: magnetic fields / galaxies: formation / methods: numerical
© ESO, 2002
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