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The morphological, spectroscopic and kinematical properties of the warminterstellar medium (wim) in early-type galaxies (ETGs) hold key observationalconstraints to nuclear activity and the buildup history of these massive,quiescent systems. High-quality integral field spectroscopy (IFS) data with awide spectral and spatial coverage, such as those from the CALIFA survey, offeran unprecedented opportunity for advancing our understanding of the wim inETGs. This article centers on a 2D investigation of the wim component in 32nearby (<~150Mpc) ETGs from CALIFA, complementing a previous 1D analysis of thesame sample (Papaderos et al. 2013; P13). We include here H\alpha\ intensityand equivalent width (EW) maps and radial profiles, diagnostic emission-lineratios, besides ionized-gas and stellar kinematics. This study is supplementedby \tau-ratio maps as an efficient means to quantify the role ofphotoionization by pAGB stars, as compared to other mechanisms (e.g., AGN,low-level star formation). Additionally, we extend the tentative classificationproposed in P13 by the type i+, which is assigned to a subset of type i ETGsexhibiting ongoing low-level star-formation (SF) in their periphery. Thisfinding along with faint traces of localized SF in the extranuclear componentof several of our sample ETGs points to a non-negligible contribution by OBstars to the total ionizing budget. We also demonstrate that, at the typicalemission-line detection threshold of ~2\AA in previous studies, most of theextranuclear wim emission in an ETG may evade detection, which could in turnprompt its classification as an entirely gas-devoid system. This study addsfurther observational evidence for a considerable heterogeneity among ETGs withregard to the physical properties and 2D kinematics of the wim component, andunderscores the importance of IFS studies over their entire optical extent.

The warm ionized gas in CALIFA early-type galaxies: 2D emission-line patterns and kinematics for 32 galaxies