ViCTORIA project: MeerKAT HI observations of the ram pressure stripped galaxy NGC 4523
A. Boselli, P. Serra, F. de Gasperin, B. Vollmer, P. Amram, H. W., Edler, M. Fossati, G. Consolandi, P. Cote, J.C. Cuillandre, L. Ferrarese, S., Gwyn, J. Postma, M. Boquien, J. Braine, F. Combes, G. Gavazzi, G. Hensler,, M.A. Miville-Deschenes, M. Murgia, J. Roediger, Y. Roehlly

TL;DR
This study presents high-resolution MeerKAT HI observations of NGC 4523, revealing a gas tail caused by ram pressure stripping as the galaxy infalls into the Virgo cluster, with implications for understanding galaxy evolution in clusters.
Contribution
First detailed MeerKAT HI observations of NGC 4523 showing ram pressure stripping effects and infall dynamics in the Virgo cluster.
Findings
Detection of a 10 kpc HI gas tail associated with NGC 4523.
Evidence of ongoing ram pressure stripping affecting the galaxy.
Presence of young HII regions formed within the stripped gas tail.
Abstract
We present the first results of a 21 cm HI line pilot observation carried out with MeerKAT in preparation for the ViCTORIA project, an untargeted survey of the Virgo galaxy cluster. The extraordinary quality of the data in terms of sensitivity and angular resolution (rms~0.65 mJy beam^-1 at ~27"x39" and 11 km/s resolution) allowed us to detect an extended (~10 kpc projected length) low column density (N(HI) < 2.5x10^20 cm^-2) HI gas tail associated with the dwarf irregular galaxy NGC4523 at the northern edge of the cluster. The morphology of the tail and of the stellar disc suggest that the galaxy is suffering a hydrodynamic interaction with the surrounding hot intracluster medium (ICM; ram pressure stripping). The orientation of the trailing tail, the gradient in the HI gas column density at the interface between the cold ISM and the hot ICM, the velocity of the galaxy with respect to…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena · Astronomical Observations and Instrumentation
