We report on observations of ESO156-G029, member of a galaxy group which is positioned at the virial radius of cluster Abell 3193. ESO156-G029 is located ~ 1.4 Mpc in projected distance from the brightest cluster galaxy NGC1500. We show that ESO156-G029 has disturbed gas kinematics and a highly asymmetric neutral hydrogen (HI) distribution, which are consequences of group pre-processing, and possibly of ram-pressure. Based on the current data we propose a scenario in which ESO156-G029 had a minor gas-rich merger in the past and now starts to experience ram-pressure. We infer that the galaxy will undergo rapid evolution once it gets closer to the cluster centre (less than 0.5 Mpc) where ram-pressure is strong enough to begin stripping the HI from the galaxy.
@article{arxiv.1909.01509,
title = {Group pre-processing versus cluster ram-pressure stripping: the case of ESO156-G029},
author = {Robert Dzudzar and Virginia Kilborn and Chandrashekar Murugeshan and Gerhardt Meurer and Sarah M. Sweet and Mary Putman},
journal= {arXiv preprint arXiv:1909.01509},
year = {2019}
}
Comments
6 pages, 3 figures, accepted for publication in MNRAS