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Le vent nous portera...towards a better understanding of cold gas around galaxies

Max Gronke

Évènements associés

  • Le lundi 11 mars 2019 de 11:00 à 12:00

Galactic winds are large-scale, multiphase outflows from galaxies and crucial in order to understand galaxy evolution. They are, for instance, a potent probe for the underlying feedback mechanisms. The usual picture is that the cold gas has been accelerated by ram pressure forces due to the hot gas. However, reproducing this ubiquitous observation in hydrodynamical simulations has proven to be challenging - simply because the destruction time is shorter than the acceleration time. During my talk, I will show some analytical estimates and results from recent (magneto-)hydrodynamics simulations which suggest a solution to this classical « entrainment problem ». I will conclude by discussing potential observables of cold gas in the surroundings of galaxies. In particular, I want to show that the Lyman-alpha line is a powerful probe of the (small-scale) structure of neutral hydrogen.