Volume 411, Number 2, November IV 2003
|Page(s)||L469 - L472|
|Published online||17 November 2003|
Letter to the Editor
The large extent of dark matter haloes probed by the formation of tidal dwarf galaxies
CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, 91191 Gif-sur-Yvette Cedex, France
2 École Normale Supérieure, 45 rue d'Ulm, 75005 Paris, France
3 CNRS FRE 2591
Corresponding author: F. Bournaud, Frederic.Bournaud@obspm.fr
Accepted: 27 September 2003
In several interacting systems, gas accumulations as massive as 109 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.
Key words: galaxies: formation, evolution, interactions, haloes
© ESO, 2003
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