Séminaire Univers / |
| « Emergence and physical origin of environmental effect patterns in galaxy groups » |
|
Jinsu Rhee |
| The role of environments in galaxy evolution has traditionally been studied at the two extremes: galaxy clusters and the field. In particular, red and dead galaxies are preferentially found in high-density regions. However, a substantial fraction of galaxies reside in intermediate-density environments, namely galaxy groups, highlighting the importance of groups in galaxy evolution. Despite this significance, the dominant population of satellite galaxies in groups is low-mass and faint, which has limited detailed investigations in both observations and simulations. To address this, we employ high-resolution cosmological zoom-in simulations to examine how satellite galaxies evolve in low-virial-mass systems. We find that satellite galaxies in groups exhibit distinct patterns of SF quenching and gas stripping compared to their counterparts in clusters. In clusters, gas stripping is primarily driven by strong ram pressure from the intracluster medium (ICM). In contrast, group satellite galaxies experience gas removal mainly through interactions with neighboring galaxies, gas clumps, and galactic outflows. In addition, group satellites display complex SF quenching behaviors, with quenching occurring near group centers and rejuvenation in the outskirts. Unlike the relatively simple delay-then-rapid quenching scenario often invoked for cluster galaxies, satellite galaxies in groups follow a more diverse set of gas-stripping and quenching pathways, primarily driven by their weaker gravitational potentials and the milder environmental effects. These results point to the need for a more nuanced description of galaxy evolution across different host halo mass scales. |
|
mardi 10 mars 2026 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |