Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The large extent of dark matter haloes probed by the formation of tidal
  dwarf galaxies   In several interacting systems, gas accumulations as massive as 10^9 solar
masses are observed near the tip of tidal tails, and are thought to be possible
progenitors of Tidal Dwarf Galaxies. Using N-body simulations of galaxy
interactions, we show that the existence of such features requires that dark
matter haloes around spiral galaxies extend at least ten times further than the
stellar disks. The massive gas clouds formed in our simulations have a
kinematical origin and gravitationally collapse into dwarf galaxies that often
survive for a few billion years.

28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas