Vorschau

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Abstract

I address the satellite debris distribution in the Milky Way (MW) environment by means of N-body simulations, combining full N-body MW models with realistic high-resolution N-body satellites and cosmologically motivated initial conditions. For the choice of the code, I perform a benchmark on previous N-body simulations of the MW environment, proving that Gadget-2 performs similar to more modern codes, and that Gadget-4 offers an improved momentum conservation compared to Gadget-2. Then, with Gadget-4 I simulate the satellite debris distribution in the MW environment. Stars are stripped less efficiently than dark matter (DM) from the satellites and larger fractions of stellar debris are found in the MW central regions, where the stellar and DM debris have different orientations and do not change them significantly if the MW disc is initially tilted. I conclude that the satellite initial conditions have more impact than the disc on the local debris orientation, and that the DM and stellar debris are spatially uncorrelated. Finally, I present a study of the bar in an N-body MW model that matches the observational constraints of the Galaxy. The strong bar formed in this simulation is a slow rotator that influences the local disc kinematics and dynamics and does not present significant buckling.