The Atlas3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies
Richard M. McDermid, Katherine Alatalo, Leo Blitz, Frederic Bournaud,, Martin Bureau, Michele Cappellari, Alison F. Crocker, Roger L. Davies,, Timothy A. Davis, P. T. de Zeeuw, Pierre-Alain Duc, Eric Emsellem, Sadegh, Khochfar, Davor Krajnovic, Harald Kuntschner

TL;DR
This study analyzes the stellar populations of early-type galaxies from the Atlas3D survey, revealing how galaxy mass and environment influence star formation histories, ages, metallicities, and alpha enhancements.
Contribution
It provides a comprehensive analysis of stellar population parameters and star formation histories across a large galaxy sample, using homogeneous methods and linking properties to galaxy mass and environment.
Findings
Massive galaxies formed 90% of their stars by z~2.
Lower-mass galaxies have more extended star formation histories.
Environmental density affects galaxy age and chemical properties.
Abstract
We present the stellar population content of early-type galaxies from the Atlas3D survey. Using spectra integrated within apertures covering up to one effective radius, we apply two methods: one based on measuring line-strength indices and applying single stellar population (SSP) models to derive SSP-equivalent values of stellar age, metallicity, and alpha enhancement; and one based on spectral fitting to derive non-parametric star-formation histories, mass-weighted average values of age, metallicity, and half-mass formation timescales. Using homogeneously derived effective radii and dynamically-determined galaxy masses, we present the distribution of stellar population parameters on the Mass Plane (M_JAM, Sigma_e, R_maj), showing that at fixed mass, compact early-type galaxies are on average older, more metal-rich, and more alpha-enhanced than their larger counterparts. From…
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