Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Fields in Young Galaxies   We have studied the fate of initial magnetic fields in the hot halo gas out
of which the visible parts of galaxies form, using three-dimensional numerical
MHD-experiments. The halo gas undergoes compression by several orders of
magnitude in the subsonic cooling flow that forms the cold disk. The magnetic
field is carried along and is amplified considerably in the process, reaching
muG levels for reasonable values of the initial ratio of magnetic to thermal
energy density.

22
The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin