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We present the discovery of a prominent bifurcation between early-typegalaxies and late-type galaxies, in [4.6]-[12] micron colors from the WideField Infrared Survey Explorer (WISE). We then use an emission-line diagnosticcomparison sample to explore the nature of objects found both within, and nearthe edges of, this WISE infrared transition zone (IRTZ). We hypothesize thatthis birfurcation might be due to the presence of hot dust and PAH emissionfeatures in late-type galaxies. Using a sample of galaxies selected through theShocked Poststarburst Galaxy Survey (SPOGS), we are able to identify galaxieswith strong Balmer absorption (EW(Hdelta)>5 Angstroms) as well as emissionlines inconsistent with star formation (deemed SPOG candidates, or SPOGs*) thatlie within the optical green valley. Seyferts and low ionization nuclearemission line regions, whose u-r colors tend to be red, are stronglyrepresented within the IRTZ, whereas SPOGs* tend to sit near the star-formingedge. Although AGN are well-represented in the IRTZ, we argue that the dominantIRTZ population are galaxies that are in late stages of transitioning acrossthe optical green valley, shedding the last of their remnant interstellarmedia.

Catching Quenching Galaxies: The Nature of the WISE Infrared Transition Zone