  Post-starburst galaxies (PSBs) have recently and rapidly quenched their
star-formation, thus they are an important way to understand how galaxies
transition from star-forming late-types to quiescent early-types. The recent
discovery of large cold gas reservoirs in PSBs calls into question the theory
that galaxies must lose their gas to become quiescent. Optical Integral Field
Spectroscopy (IFS) surveys have revealed two classes of PSBs: central PSBs with
central quenching regions and ring PSBs with quenching in their outskirts. We
analyze a sample of 13 nearby (z < 0.1) PSBs with spatially resolved optical
IFS data from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA)
survey and matched resolution Atacama Large (sub-)Millimeter Array (ALMA)
observations of $^{12}$CO(1-0). Disturbed stellar kinematics in 7/13 of our
PSBs and centrally concentrated molecular gas is consistent with a recent
merger for most of our sample. In galaxies without merger evidence, alternate
processes may funnel gas inwards and suppress star-formation, which may include
outflows, stellar bars, and minor mergers or interactions. The star-formation
efficiencies of the post-starburst regions in nearly half our galaxies are
suppressed while the gas fractions are consistent with star-forming galaxies.
AGN feedback may drive this stabilization, and we observe AGN-consistent
emission in the centers of 5/13 galaxies. Finally, our central and ring PSBs
have similar properties except the ionized and molecular gas in central PSBs is
more disturbed. Overall, the molecular gas in our PSBs tends to be compact and
highly disturbed, resulting in concentrated gas reservoirs unable to form stars
efficiently.

Astrophysics of Galaxies