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Gas rich galaxies are typically star-forming. We make use of HI-MaNGA, aprogram of HI follow-up for the Mapping Nearby Galaxies at Apache PointObservatory (MaNGA) survey of the Sloan Digital Sky Surveys to construct asample of unusual neutral hydrogen (HI, 21cm) rich galaxies which have low StarFormation Rates (SFRs); using infra-red color from the Wide-field InfraredSurvey Explorer (WISE) as a proxy for specific SFR. Out of a set of 1575 MaNGAgalaxies with HI-MaNGA detections, we find 83 (5%) meet our selection criteriato be HI rich with low SFR. We construct two stellar mass-matched controlsamples: HI rich galaxies with typical SFR (High SF Control) and HI poorgalaxies with low SFR (Low HI Control). We investigate the properties of eachof these samples, comparing physical parameters such as ionization state maps,stellar and ionized gas velocity and dispersion, environment measures,metallicity, and morphology to search for the reasons why these unusual HI richgalaxies are not forming stars. We find evidence for recent external accretionof gas in some galaxies (via high counter-rotating fractions), along with someevidence for AGN feedback (from a high cLIER and/or red geyser fraction), andbar quenching (via an enhanced strong bar fraction). Some galaxies in thesample are consistent with simply having their HI in a high angular momentum,large radius, low density disc. We conclude that no single physical process canexplain all HI rich, low SFR galaxies.

HI Rich but Low Star Formation galaxies in MaNGA: Physical Properties and Comparison to Control Samples