Missing Mass in Collisional Debris from Galaxies

Details Missing Mass in Collisional Debris from Galaxies Missing Mass in Collisional Debris from Galaxies

2007-05-09

arxiv.org/abs/0705.1356v1

Science, 316, 1166 (2007)

Astronomy and Astrophysics

Astrophysics

Published in Science. Complete manuscript with appendix available at http://www.uni-sw.gwdg.de/~paduc/articles/bournaud_tdg_dm

Scientific paper

10.1126/science.1142114

Recycled dwarf galaxies can form in the collisional debris of massive galaxies. Theoretical models predict that, contrary to classical galaxies, they should be free of non-baryonic Dark Matter. Analyzing the observed gas kinematics of such recycled galaxies with the help of a numerical model, we demonstrate that they do contain a massive dark component amounting to about twice the visible matter. Staying within the standard cosmological framework, this result most likely indicates the presence of large amounts of unseen, presumably cold, molecular gas. This additional mass should be present in the disks of their progenitor spiral galaxies, accounting for a significant part of the so-called missing baryons.

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