Ram pressure candidates in UNIONS

ABSTRACT We present a search for disturbed, candidate ram pressure stripping galaxies across more than 50 spectroscopically selected SDSS groups and clusters. 48 candidates are visually identified in these systems using high-quality UNIONS imaging from the Canada-France-Hawaii Telescope, covering ${\sim }6200\, \mathrm{deg^2}$ }2800\, u- r-bands, respectively. Ram found clusters spanning wide range halo mass include ?30 group regime (Mh < 1014). The observed frequency of shows substantial scatter with group/cluster mass, but on average is larger ($M_h \ge 10^{14}\, \mathrm{M_\odot }$) \lt by factor ?2. find that most commonly low-mass have enhanced star formation rates relative to star-forming field galaxies. enhancement largely independent galaxy strongest As result large survey footprint excellent image quality UNIONS, we able identify disturbed galaxies, potentially affected stripping, host environment.