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Date and Time of the Query: 2019-07-23 T02:05:48 PDT
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For refcode 2013ApJ...778L...2C:
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Copyright by American Astronomical Society. Reproduced by permission
2013ApJ...778L...2C Effect of Environment on Galaxies' Mass-Size Distribution: Unveiling the Transition from outside-in to inside-out Evolution Cappellari, Michele Abstract. The distribution of galaxies on the mass-size plane as a function of redshift or environment is a powerful test for galaxy formation models. Here we use integral-field stellar kinematics to interpret the variation of the mass-size distribution in two galaxy samples spanning extreme environmental densities. The samples are both identically and nearly mass-selected (stellar mass M_*_ >~ 6 x 10^9^ M_sun_) and volume-limited. The first consists of nearby field galaxies from the ATLAS^3D^ parent sample. The second consists of galaxies in the Coma Cluster (Abell 1656), one of the densest environments for which good, resolved spectroscopy can be obtained. The mass-size distribution in the dense environment differs from the field one in two ways: (1) spiral galaxies are replaced by bulge-dominated disk-like fast-rotator early-type galaxies (ETGs), which follow the same mass-size relation and have the same mass distribution as in the field sample; (2) the slow-rotator ETGs are segregated in mass from the fast rotators, with their size increasing proportionally to their mass. A transition between the two processes appears around the stellar mass M_crit_ ~ 2 x 10^11^ M_sun_. We interpret this as evidence for bulge growth (outside-in evolution) and bulge-related environmental quenching dominating at low masses, with little influence from merging. In contrast, significant dry mergers (inside-out evolution) and halo-related quenching drives the mass and size growth at the high-mass end. The existence of these two processes naturally explains the diverse size evolution of galaxies of different masses and the separability of mass and environmental quenching. Key words: galaxies: clusters: individual: Abell 1656, galaxies: evolution, galaxies: formation, galaxies: structure
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