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The distribution of galaxies on the mass-size plane as a function of redshiftor environment is a powerful test for galaxy formation models. Here we useintegral-field stellar kinematics to interpret the variation of the mass-sizedistribution in two galaxy samples spanning extreme environmental densities.The samples are both identically and nearly mass-selected (stellar mass M*>6e9Msun) and volume-limited. The first consists of nearby field galaxies from theAtlas3D parent sample. The second consists of galaxies in the Coma Cluster(Abell 1656), one of densest environments for which good resolved spectroscopycan be obtained. The mass-size distribution in the dense environment differsfrom the field one in two ways: (i) spiral galaxies are replaced bybulge-dominated disk-like fast-rotator early-type galaxies (ETGs), which followthe SAME mass-size relation and have the SAME mass distribution as in the fieldsample; (ii) the slow rotator ETGs are segregated in mass from the fastrotators, with their size increasing proportionally to their mass. A transitionbetween the two processes appears around the stellar mass M_crit=2e11 Msun. Weinterpret this as evidence for bulge growth (outside-in evolution) andbulge-related environmental quenching dominating at low masses, with littleinfluence from merging, while significant dry mergers (inside-out evolution)and halo-related quenching driving the mass and size growth at the high-massend. The existence of these two processes naturally explains the diverse sizeevolution of galaxies of different masses and the separability of mass andenvironmental quenching.

Effect of environment on galaxies mass-size distribution: unveiling the transition from outside-in to inside-out evolution