# A Tale of Tails: Star Formation and Stripping in Jellyfish Galaxies in the Strong Lensing Cluster MACS J0138.0-2155

## TL;DR

This study examines ram-pressure stripping effects on four galaxies in the MACS J0138.0-2155 cluster, revealing detailed kinematic and star formation properties of jellyfish galaxies using multi-wavelength data.

## Contribution

It provides the first detailed spatially resolved analysis of gas and stellar kinematics in jellyfish galaxies within a strong lensing cluster at z=0.336.

## Key findings

- Jellyfish galaxies show significant gas tails and velocity gradients.
- Star formation rates in tails reach up to 0.49 M_sun/yr/kpc^2.
- Two galaxies exhibit post-starburst features in their disks.

## Abstract

We investigate the effects of ram-pressure stripping on four galaxies within the massive, strong-lensing cluster MACS-J0138.0-2155 ($z=0.336$). Of these, three are classified as jellyfish galaxies, with significant elongated tails. Two of these jellyfish galaxies, J1 and J2, are in a late-stage of stripping and show post-starburst features within their disk regions with star formation only in the tails. Using VLT/MUSE integral field spectroscopic data, we spatially resolve the stellar and gas kinematics to examine extraplanar gas associated with ram-pressure stripping. We complement this analysis with optical and near-infrared imaging from the Hubble Space Telescope to visualize the galactic structure of each member. The jellyfish galaxies are all blue-shifted with respect to the cluster and show velocity gradients of a few hundred $\mathrm{kms}^{-1}$ across their tails. From the resolved gas kinematics, we derive H$\alpha$-based star formation rates; these are generally low reaching a maximum of approximately 0.49 $\mathrm{M_{\odot}\text{yr}^{-1}kpc^{-2}}$ in galaxy J3. We also report the kinematics for galaxy J4, which lies in the foreground of the cluster but close in projection to one of the lensed arcs.