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