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Paper: Interaction Between Dark Matter Sub-halos and Gaseous Galactic Disk
Volume: 453, Advances in Computational Astrophysics: Methods, Tools, and Outcome
Page: 361
Authors: Kannan, R.; Macciò, A.; Pasquali, A.; Moster, B. P.; Walter, F.
Abstract: We investigate the idea of Dark Matter (DM) sub-halo interaction with the gaseous disc as the origin of holes and shells found in the neutral hydrogen (HI) distributions of galaxies. High resolution hydrodynamic simulations show that pure DM sub-halos impacting a galactic disk produce high density regions and not holes. Sub-halos containing small amounts of gas are able to form holes.When mass and orbital distributions of DM haloes derived from cosmological N-body simulations are used, we find that the frequency of sub-halo - disk encounters able to produce observable holes is very low. This leads us to conclude that DM impact is not the major channel through which these holes are formed.
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