The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 42 Issue 2
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- Pages.76.1-76.1
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- 2017
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- 1226-2692(pISSN)
Galactic gas depletion process in cosmological hydrodynamic cluster zoom-in simulation
- Jung, Seoyoung (Yonsei university) ;
- Choi, Hoseung (Yonsei university) ;
- Yi, Sukyoung K. (Yonsei university)
- Published : 2017.10.10
Abstract
In cluster environments, most of the galaxies are found to be red and dead, but the origin of these passive galaxies is not yet clearly understood. Using a set of cosmological hydrodynamic zoom-in simulations, we study gas depletion process in and outside clusters. Our results are consistent with previous studies showing rapid stripping of a galactic cold gas reservoir during the first infall to the cluster center. Moreover, we found a fraction of galaxies that were already in the gas deficient state before reaching the cluster (i.e., pre-processed galaxies) is non-negligible. These findings lead to the idea that a complete understanding of passive galaxy population in clusters can not be achieved without a detailed understanding of gas stripping process in group size halos prior to the cluster infall.
Keywords