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Group pre-processing versus cluster ram-pressure stripping: the case of ESO156-G029

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arxiv 1909.01509 v1 pith:BDKC2KH5 submitted 2019-09-04 astro-ph.GA

Robert Dzudzar , Virginia Kilborn , Chandrashekar Murugeshan , Gerhardt Meurer , Sarah M. Sweet , Mary Putman This is my paper
classification astro-ph.GA
keywords eso156-g029clustergalaxyram-pressuregrouppre-processingstrippingabell
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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.

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