<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Jellyfish Galaxies and the Multiphase Nature of Gas Around Galaxies"^^ . "Gas is everywhere throughout the Universe, from the gas between galaxies, the intergalactic medium (IGM), to the gas surrounding a galaxy, the circumgalactic medium (CGM), to the gas within a galaxy, the interstellar medium (ISM). According to the standard paradigm, galaxies form at the centers of dark matter halos out of gas that cools from the otherwise hot gaseous atmospheres around them. In turn, the latter are influenced by accreting material from the IGM, by outflowing gas due to feedback, and by infalling satellite galaxies. \r\n\r\nIn this thesis, I investigate the complex relationship between satellite galaxies and the multiphase host halo gas using the cosmological magneto-hydrodynamical simulations TNG-Cluster and TNG50, the highest-resolution simulation from the IllustrisTNG suite. These simulations provide an unparalleled combination of resolution and sample size, coupled with a well-validated galaxy formation model, enabling several novel insights.\r\n\r\nFirst, in TNG-Cluster, I affirm that massive cluster satellites, with masses similar to or larger than the Milky Way, are capable of retaining their own hot, X-ray-emitting gaseous atmospheres. These atmospheres should be statistically detectable with current and upcoming X-ray surveys and instruments. In contrast, for less massive satellites in smaller groups and clusters, I demonstrate that the ram pressure tails observed in TNG50 ``jellyfish\" galaxies originate from the satellite’s interstellar medium. As this cool, metal-enriched gas is stripped from the jellyfish galaxies, it is deposited into the host halo. Consequently, satellites contribute more cool gas to galaxy groups and clusters than is present in them today.\r\n\r\nFurthermore, I demonstrate that across cosmic time, the mass of the cool intracluster medium in cluster progenitors correlates with the number of gaseous satellites, affirming that satellites are a legitimate source of cool halo gas, according to TNG. Moreover, I illustrate the complex evolution of the cool intracluster medium, considering interconnected processes such as gas accretion from the intergalactic medium, gas heating and cooling, satellite stripping, star formation, and, most importantly, feedback from the central supermassive black hole. In TNG-Cluster, the total mass of the cool-phase intracluster medium unambiguously decreases since z~1-4, over the past ~10-12 billion years, just after the onset of strong, kinetic-mode feedback from the central supermassive black hole. \r\n\r\nThese novel results challenge long-standing ideas about the evolution of both satellite and central galaxies, offering fresh insights into the role of environmental effects and feedback processes. I propose specific observational tests to validate these simulation predictions, providing a clear path for future empirical investigations. Comparing these simulation outcomes with data from current and upcoming surveys will sharpen our understanding of galaxy formation and evolution, ultimately guiding the development of more sophisticated galaxy formation models for next-generation cosmological simulations."^^ . "2025" . . . . . . . "Eric"^^ . "Rohr"^^ . "Eric Rohr"^^ . . . . . . "Jellyfish Galaxies and the Multiphase Nature of Gas Around Galaxies (PDF)"^^ . . . "Rohr_PhDThesis.pdf"^^ . . . "Jellyfish Galaxies and the Multiphase Nature of Gas Around Galaxies (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Jellyfish Galaxies and the Multiphase Nature of Gas Around Galaxies (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Jellyfish Galaxies and the Multiphase Nature of Gas Around Galaxies (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Jellyfish Galaxies and the Multiphase Nature of Gas Around Galaxies (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Jellyfish Galaxies and the Multiphase Nature of Gas Around Galaxies (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #35995 \n\nJellyfish Galaxies and the Multiphase Nature of Gas Around Galaxies\n\n" . "text/html" . . . "520 Astronomie"@de . "520 Astronomy and allied sciences"@en . .