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OATS-DAUT SEMINAR
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Speaker: Chiara Mastropietro (USM, Munich)

Title: Ram-pressure versus tides: when gravity is only part of the story

Date: Wednesday, February 20th, 2008
Time: 12:00
Venue: Villa Bazzoni

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Abstract:
How does the combined effect of gravitational and hydrodynamical forces affect the evolution of a substructure orbiting in a dense environment? The well known ''Bullet Cluster'' (1E0657-56) probably represents the most extreme case where the behavior of the collision dominated hot gas is clearly distinguishable from the collisionless stellar and dark matter components. On a completely different ram-pressure regime, the gaseous Magellanic Stream, which stretches for over 100 degrees in the Southern Sky, is the most prominent signature of an ongoing interaction between the hot halo of the Milky Way and the Large Magellanic Cloud. Could ram-pressure stripping from a tenuous Galactic halo be also advocated to explain the lack of gas observed in many dwarf spheroidal galaxies in the Local Group?
I will present the results of high resolution N-body/SPH simulations where the morphological and kinematical evolution of the substructures is modeled in details.
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contact: Andrea Biviano (OATS)