The hydrodynamics of Cosmic filaments

Filaments from the cosmic web are responsible for feeding galaxies with most of their gas and supply the majority of gas that ultimately makes stars I will discuss three different phases of cosmic filament evolution: 1 filament formation 2 penetration of filaments into halos and 3 filament galaxy interactions During filament formation from cosmic initial perturbation gas falls into filaments and usually shocks I will examine the conditions for such a shock to be present Penetration of filaments into halos creates shear flows that may trigger Kelvin Helmholtz instability between the halo gas and the filaments I will present a novel analysis about the linear and non linear evolution of the instability Finally filament galaxy interaction requires the gas to penetrate through galactic magnetic fields before the gas can join the interstellar medium I will discuss an analytic estimation of this behavior as a function of filament and galactic properties