WALLABY pilot survey: the potential polar ring galaxies NGC 4632 and NGC 6156

ABSTRACT We report on the discovery of two potential polar ring galaxies (PRGs) in WALLABY Pilot Data Release 1 (PDR1). These untargeted detections, cross-matched to NGC 4632 and 6156, are some first where H i observations show distinct components. used iDaVIE virtual reality software separate anomalous gas from galactic found that comprises ∼50 per cent total content both systems. have generated plausible 3D kinematic models for each galaxy, assuming rings circular inclined at 90° galaxy bodies. data consistent with PRGs but do not definitively prove PRGs. By projecting these different combinations main disc inclinations, orientations, angular resolutions mock cubes, we further investigated detectability similar WALLABY. Assuming indeed PRGs, fraction, combined size distribution PDR1 galaxies, implies an incidence rate ∼1–3 cent. If this holds true, survey will detect hundreds new galaxies.