Although ultra diffuse galaxies (UDGs) are found in large numbers in clusters of galaxies, the role of the cluster environment in shaping their low surface brightness and large sizes is still uncertain. Here we examine a sample of UDGs in the Hydra I cluster (D = 51 Mpc) with new radial velocities obtained as part of the LEWIS (Looking into the faintest with MUSE) project using VLT/MUSE data. Using a phase-space, or infall diagnostic, diagram we compare the UDGs to other known galaxies in the Hydra I cluster and to UDGs in other clusters. The UDGs, along with the bulk of regular Hydra I galaxies, have low relative velocities and are located near the cluster core, and thus consistent with very early infall into the cluster. Combining with literature data, we do not find the expected trend of GC-rich UDGs associated with earlier infall times. This result suggests that quenching mechanisms other than cluster infall should be further considered, e.g. quenching by strong feedback or in cosmic sheets and filaments. Tidal stripping of GCs in the cluster environment also warrants further modelling.
@article{arxiv.2308.11496,
title = {Ultra diffuse galaxies in the Hydra I cluster from the LEWIS Project: Phase-Space distribution and globular cluster richness},
author = {Duncan Forbes and Jonah Gannon and Enrichetta Iodice and Michael Hilker and Goran Doll and Chiara Buttitta and Antonio La Marca and Magda Arnaboldi and Michele Cantiello and G. D'Ago and Jesus Falcon Barroso and Laura Greggio and Marco Gullieuszik and Johanna Hartke and Steffen Mieske and Marco Mirabile and Roberto Rampazzo and Marina Rejkuba and Marilena Spavone and Chiara Spiniello and Giulio Capasso},
journal= {arXiv preprint arXiv:2308.11496},
year = {2023}
}