WALLABY pilot survey: first look at the Hydra I cluster and ram pressure stripping of ESO 501−G075

ABSTRACT We present results from neutral atomic hydrogen (H i) observations of Hydra I, the first cluster observed by Widefield ASKAP L-band Legacy All-sky Blind Survey (WALLABY) on Australian Square Kilometre Array Pathfinder. For time, we show that WALLABY can reach its final survey sensitivity. Leveraging sensitivity, spatial resolution, and wide field view WALLABY, identify a galaxy, ESO 501−G075, lies near virial radius I displays an H i tail. 501−G075 shows similar level morphological asymmetry as another member, which centre signs experiencing ram pressure. investigate possible environmental processes could be responsible for producing disturbance in morphology 501−G075. rule out tidal interactions, has no nearby neighbours within ∼0.34 Mpc. use simple model to determine pressure remove gas disc at radii r ≳ 25 kpc. conclude that, typical mass compared galaxies is compatible with scenario, likely recently infalling into early stages