| Issue |
A&A
Volume 393, Number 2, October II 2002
|
|
|---|---|---|
| Page(s) | 685 - 691 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20021026 | |
| Published online | 23 September 2002 | |
Generation of magnetic seed fields in self-gravitating protogalactic clouds
1
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, birk@usm.uni-muenchen.de
Received:
14
March
2002
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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