Quenched isolated dwarf galaxies by past interactions and cosmic web stripping
Jose Antonio Benavides Blanco
We study the formation of quenched dwarf galaxies in relatively isolated environments using the cosmological TNG50 simulations. We identify a sample of quenched dwarf galaxies that are not satellites of more massive host systems. About half of this sample can be attributed to backsplash orbits, while the remaining half of the population can be attributed to physical processes that have removed the gas content of the galaxy but have not significantly affected their dark matter or stellar mass content. A study of their individual evolution shows two main quenching mechanisms: a) dwarf-dwarf interactions, where the companion has taken away totally or partially the gas by ram-pressure stripping, or b) gas lost to ram-pressure stripping against denser regions of the universe such as filaments, a process known as “cosmic-web stripping”. We find typical quenching times and stellar assembly times for our quenched dwarfs that are in good agreement with observational constraints, suggesting similar mechanisms in the observed galaxies.
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