We investigate the prevalence, properties, and kinematics of extraplanardiffuse ionized gas (eDIG) in a sample of 25 edge-on galaxies selected from theCALIFA survey. We measure ionized gas scale heights from ${\rm H\alpha}$ andfind that 90% have measurable scale heights with a median of$0.8^{+0.7}_{-0.4}$ kpc. From the ${\rm H\alpha}$ kinematics, we find that 60%of galaxies show a decrease in the rotation velocity as a function of heightabove the midplane. This lag is characteristic of eDIG, and we measure a medianlag of 21 km s$^{-1}$ kpc$^{-1}$ which is comparable to lags measured in theliterature. We also investigate variations in the lag with radius. $\rmH{\small I}$ lags have been reported to systematically decrease withgalactocentric radius. We find both increasing and decreasing ionized gas lagswith radius, as well as a large number of galaxies consistent with no radiallag variation, and investigate these results in the context of internal andexternal origins for the lagging ionized gas. We confirm that the ${\rm[S{\small II}]}$/${\rm H\alpha}$ and ${\rm [N{\small II}]}$/${\rm H\alpha}$line ratios increase with height above the midplane as is characteristic ofeDIG. The ionization of the eDIG is dominated by star-forming complexes (leaky${\rm H{\small II}}$ regions). We conclude that the lagging ionized gas isturbulent ejected gas likely resulting from star formation activity in the diskas opposed to gas in the stellar thick disk or bulge. This is further evidencefor the eDIG being a product of stellar feedback and for the pervasiveness ofthis WIM-like phase in many local star-forming galaxies.

We present a systematic study of the diffuse ionized gas (DIG) in M83 and itseffects on the measurement of metallicity gradients at varying resolutionscales. Using spectrophotometric data cubes of M83 obtained at the 2.5m duPonttelescope at Las Campanas Observatory as part of the TYPHOON program, weseparate the HII regions from the DIG using the [SII]/H$\alpha$ ratio, HIIphot(HII finding algorithm) and the H$\alpha$ surface brightness. We find that thecontribution to the overall H$\alpha$ luminosity is approximately equal for theHII and DIG regions. The data is then rebinned to simulate low-resolutionobservations at varying resolution scales from 41 pc up to 1005 pc. Metallicitygradients are measured using five different metallicity diagnostics at eachresolution. We find that all metallicity diagnostics used are affected by theinclusion of DIG to varying degrees. We discuss the reasons of why themetallicity gradients are significantly affected by DIG using the HII dominanceand emission line ratio radial profiles. We find that applying the[SII]/H$\alpha$ cut will provide a closer estimate of the true metallicitygradient up to a resolution of 1005 pc for all metallicity diagnostics used inthis study.