Collisional dark matter and the structure of dark halos

Details Collisional dark matter and the structure of dark halos Collisional dark matter and the structure of dark halos

2000-02-17

arxiv.org/abs/astro-ph/0002362v3

Astrophys.J.535:L103,2000

Astronomy and Astrophysics

Astrophysics

Revised, Figure3 replaced. ApJLetters in press

Scientific paper

10.1086/312707

We study how the internal structure of dark halos is affected if Cold Dark Matter particles are assumed to have a large cross-section for elastic collisions. We identify a cluster halo in a large cosmological N-body simulation and resimulate its formation with progressively increasing resolution. We compare the structure found in the two cases where dark matter is treated as collisionless or as a fluid. For the collisionless case our results agree with those of other workers. Collisional dark matter results in a cluster which is more nearly spherical and has a more singular central density profile. Substructure within the cluster is only weakly suppressed relative to the collisionless case. The observed structure of dwarf galaxies argues against self-interacting dark matter if, as seems likely, intermediate cross-sections produce structure lying between the extremes we have simulated.

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