Leavers and remainers: Galaxies split by group-exit
arXiv:1910.03618 · doi:10.1093/mnras/stz2829
Abstract
The disruption of substructure in galaxy clusters likely plays an important role in shaping the cluster population as a significant fraction of cluster galaxies today have spent time in a previous host system, and thus may have been pre-processed. Once inside the cluster, group galaxies face the combined environmental effects from group and cluster - so called 'post-processing'. We investigate these concepts, by tracking the evolution of satellites and their hosts after entering the cluster and find that tidal forces during their first pericentric passage are very efficient at breaking up groups, preferentially removing satellites at larger distances from their hosts. 92.2% of satellites whose host has passed pericentre will leave their host by , typically no later than half a Gyr after pericentric passage. We find satellites leave with high velocities, and quickly separate to large distances from their hosts, making their identification within the cluster population challenging. Those few satellites (7.8%) that remain bound to their hosts after a pericentric passage are typically found close to their host centres. This implies that substructure seen in clusters today is very likely on first infall into the cluster, and yet to pass pericentre. This is even more likely if the substructure is extended, with satellites beyond R of their host. We find the cluster dominates the tidal mass loss and destruction of satellites, and is responsible for rapidly halting the accretion of new satellites onto hosts once they reach 0.6-0.8 R radii from the cluster.
14 pages, 14 figures, accepted for publication in MNRAS on 04.10.19
References in corpus (12)
- Cold gas stripping in satellite galaxies: from pairs to clusters
- Ram pressure stripping of disc galaxies orbiting in clusters. I. Mass and radius of the remaining gas disc
- The relation between star formation, morphology and local density in high redshift clusters and groups
- Gas stripping in galaxy groups - the case of the starburst spiral NGC 2276
- The Preferential Tidal Stripping of Dark Matter versus Stars in Galaxies
- How effective is harassment on infalling late-type dwarfs?
- LoCuSS: Pre-processing in galaxy groups falling into massive galaxy clusters at z=0.2
- On the occurrence of galaxy harassment
- Ram Pressure Stripping of Hot Coronal Gas from Group and Cluster Galaxies and the Detectability of Surviving X-ray Coronae
- Investigating the Stellar Mass Growth Histories of Satellite Galaxies as a Function of Infall Time using Phase-Space
- Tidal Interaction as the origin of early-type dwarf galaxies in group environment
- The Assembly of the Virgo Cluster, Traced by its Galaxy Halos