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• W2151073886 abstract "<i>Context. <i/>Studying outliers from the bimodal distribution of galaxies in the color-mass space, such as morphological early-type galaxies residing in the blue cloud (<i>blue E/S0s<i/>), can help for better understanding the physical mechanisms that lead galaxy migrations in this space.<i>Aims. <i/>In this paper we try to bring new clues to studying the evolution of the properties of a significant sample of blue E/S0 galaxies in the COSMOS field. <i>Methods. <i/>We define blue E/S0 galaxies as objects having a clear early-type morphology on the HST/ACS images (according to our automated classification scheme galSVM) but with a blue rest-frame color (defined by using the SED best-fit template on the COSMOS primary photometric catalogs). Combining these two measurements with spectroscopic redshifts from the zCOSMOS 10k release, we isolated 210 <i>I<i/><sub>AB<sub/> <i><<i/> 22 blue early-type galaxies with / <i>><i/> 10<sup>10<sup/> in three redshift bins (0.2 <i><<i/> <i>z<i/> <i><<i/> 0.55, 0.55 <i><<i/> <i>z<i/> <i><<i/> 0.8, 0.8 <i><<i/> <i>z<i/> <i><<i/> 1.4) and studied the evolution of their properties (number density, SFR, morphology, size).<i>Results. <i/>The threshold mass (<i>M<i/><sub>t<sub/>), defined at <i>z<i/> = 0 in previous studies as the mass below which the population of blue early-type galaxies starts to be abundant relative to passive E/S0s, evolves from log (/) ~ 10.1 <i>±<i/> 0.35 at <i>z<i/> ~ 0.3 to log (/) ~ 10.9 <i>±<i/> 0.35 at <i>z<i/> ~ 1. Interestingly, it follows the evolution of the crossover mass between the early and late type populations (bimodality mass) indicating that the abundance of blue E/S0 is another measure of the downsizing effect in the build-up of the red sequence. There seems to be a turn-over mass in the nature of blue E/S0 galaxies. Above log (/) ~ 10.8 blue E/S0 resemble to merger remnants probably migrating to the red sequence on a time scale of Gyr. Below this mass, they seem to be closer to normal late-type galaxies, as if they were the result of minor mergers that triggered the central star formation and built a central bulge component or were (re)building a disk from the surrounding gas in a much longer time scale, suggesting that they are moving back or staying in the blue cloud. This turn-over mass does not seem to evolve significantly from <i>z<i/> ~ 1 in contrast to the threshold mass and therefore does not seem to be linked with the relative abundance of blue E/S0s." @default.
• W2151073886 created "2016-06-24" @default.
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• W2151073886 date "2010-05-28" @default.
• W2151073886 modified "2023-10-06" @default.
• W2151073886 title "Evolution of blue E/S0 galaxies from<i>z</i>~ 1: merger remnants or disk-rebuilding galaxies?" @default.
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• W2151073886 doi "https://doi.org/10.1051/0004-6361/200913188" @default.
• W2151073886 hasPublicationYear "2010" @default.
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