Speaker
Description
It is known from theory and observations that galaxy evolution can be influenced by environmental effects. Processes like ram pressure stripping in groups, clusters or the cosmic web as well as tidal stripping can affect the final properties of galaxies. While the baryonic content can be influenced by both ram pressure and tidal forces, the DM content can only be influenced by tidal stripping when assuming a universe with cold dark matter. Based on a high-resolution cosmological simulation run in the $\Lambda$CDM framework I will show how a non negligible (25 %) galaxy population is affected by environmental processes and how this is affecting the baryon and DM content of these galaxies. I will further show that the galaxy sample that interacts with the environment can be divided into two sub-groups which both trace different parts of the large scale structure of the universe. First, galaxies that are only affected by ram pressure forces – which I will term COSWEBs – lose baryons and are tracing the filaments of the cosmic web. And second, galaxies that are affected by both, ram pressure and tidal forces, lose both baryons and DM. These galaxies – which I will term flyby galaxies – interact with the most massive systems in the simulation and trace the nodes of the cosmic web. At the end of the talk I will comment on the possibility to produce DM deficient field galaxies via this flyby process.
