The large extent of dark matter haloes probed by the formation of tidal dwarf galaxies

Details The large extent of dark matter haloes probed by the formation of tidal dwarf galaxies The large extent of dark matter haloes probed by the formation of tidal dwarf galaxies

2003-09-30

arxiv.org/abs/astro-ph/0309812v1

Astron.Astrophys.411:L469-L472,2003

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A 4 pages, 3 figures

Scientific paper

10.1051/0004-6361:20031520

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.

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