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- W2133864853 abstract "We present results of a study of the stellar age distributions in the sample of elliptical-like objects (ELOs) identified at z = 0 in four hydrodynamic, self-consistent simulations operating in the context of a concordance cosmological model. The simulations show that the formation of most stars in each ELO of the sample is a consequence of violent dynamical events, either fast multiclump collapse at high z's, or mergers at lower z's. The latter can explain the age spread as well as the dynamical peculiarities observed in some ellipticals, but its relative weight is never dominant and decreases as the ELO mass at the halo scale, Mvir, increases, to such an extent that some recent mergers contributing an important fraction to the total ELO mass can possibly contribute only a small fraction of newborn stars. More massive objects have older means and narrower spreads in their stellar age distributions than less massive objects. The ELO sample shows also a tight correlation between Mvir and the central stellar line-of-sight velocity dispersion, σ. This gives a trend of the means and spreads of ELO stellar populations with σ that is consistent, even quantitatively, with the age effects observationally detected in the stellar populations of elliptical galaxies. Therefore, these effects can be explained as the observational manifestation of the intrinsic correlations found in the ELO sample between Mvir and the properties of the stellar age distribution, on the one hand, and Mvir and σ, on the other hand. These correlations hint, for the first time, at a possible way to reconcile age effects in ellipticals, and, particularly, the increase of α/Fe ratios with σ, with the hierarchical clustering paradigm. We briefly discuss the origin of the intrinsic correlations shown by ELOs in terms of the adhesion model." @default.
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- W2133864853 date "2004-07-19" @default.
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- W2133864853 title "Elliptical Galaxies at z = 0 from Self-consistent Hydrodynamic Simulations: Clues on Age Effects in Their Stellar Populations" @default.
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- W2133864853 doi "https://doi.org/10.1086/423839" @default.
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