Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark Matter in Low Surface Brightness Galaxies   Low Surface Brightness (LSB) galaxies form a large population of disc
galaxies that extend the Hubble sequence towards extreme late-types. They are
only slowly evolving, and still in an early evolutionary state. The
Tully-Fisher relation and rotation curves of LSB galaxies both show that LSB
galaxies are very dark-matter dominated with respect to ``normal'' high surface
brightness (HSB) galaxies. Mass models derived from the rotation curves of LSB
and HSB galaxies show that LSB galaxies inhabit less dense and more extended
halos. Mass density, which changes with surface brightness, is as important in
determining the evolution of a galaxy as total mass is.

1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys