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We compare the stellar populations and complex neutral gas dynamics of theM81 group dIrr galaxy DDO 165 using data from the HST and the VLA. Paper Iidentified two kinematically distinct HI components, multiple localized highvelocity gas features, and eight HI holes and shells (the largest of whichspans ~2.2x1.1 kpc). Using the spatial and temporal information from thestellar populations in DDO 165, we compare the patterns of star formation overthe past 500 Myr with the HI dynamics. We extract localized star formationhistories within 6 of the 8 HI holes identified in Paper I, as well as 23 otherregions that sample a range of stellar densities and neutral gas properties.From population synthesis modeling, we derive the energy outputs (from stellarwinds and supernovae) of the stellar populations within these regions over thelast 100 Myr, and compare with refined estimates of the energies required tocreate the HI holes. In all cases, we find that "feedback" is energeticallycapable of creating the observed structures in the ISM. Numerous regions withsignificant energy inputs from feedback lack coherent HI structures but showprominent localized high velocity gas features; this feedback signature is anatural product of temporally and spatially distributed star formation. In DDO165, the extended period of heightened star formation activity (lasting morethan 1 Gyr) is energetically capable of creating the observed holes and highvelocity gas features in the neutral ISM.

The M81 Group Dwarf Irregular Galaxy DDO 165. II. Connecting Recent Star Formation with ISM Structures and Kinematics