Identifying and Distinguishing Quenching Galaxies with Spatially Resolved Star Formation in the Hubble Frontier Fields

We investigate the nature and prevalence of different quenching signatures for 1437 galaxies with M* 10 8 M and SFR 10-3 M yr-1 in the Hubble Frontier Fields through spatially resolved spectral energy distribution fitting with FAST++. We use the morphological metrics previously presented in our series of investigations to quantify the distribution of star formation, and use a k-nearest neighbors algorithm to classify quenching galaxies into different quenching pathways, including an inside-out pathway and an outside-in pathway. We find 129 galaxies have morphologies consistent with an inside-out quenching pathway, and 70 are consistent with an outside-in pathway. Inside-out quenching galaxies are 0.8+0.2-0.1 dex more massive compared to outside-in quenching galaxies, where both populations are more massive in clusters than the field, by 0.8+0.3-0.1 dex. Inside-out quenching galaxies are found more often in clusters (106/129), compared to outside-in quenching galaxies (25/70). In clusters, the fraction of inside-out quenching galaxies strongly increases with mass, representing about 30% of the non-quenched galaxy population at high masses. A milder evolution is seen in the field. The fraction of outside-in quenching galaxies is independent of mass, representing 10% of the non-quenched population, in both the cluster and field. We find no strong dependence for the fraction of any population with estimated infall time, except massive inside-out quenching galaxies, which increase in fraction with increasing infall time.