SPIDER – X. Environmental effects in central and satellite early-type galaxies through the stellar fossil record

A detailed analysis of how environment affects the star formation history of early-type galaxies (ETGs) is undertaken via high signal-to-noise ratio stacked spectra obtained from a sample of 20 977 ETGs (morphologically selected) from the Sloan Digital Sky Survey-based SPIDER survey. Two major param...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2014-12, Vol.445 (2), p.1977-1977
Main Authors: La Barbera, F, Pasquali, A, Ferreras, I, Gallazzi, A, de Carvalho, R R, de la Rosa, I G
Format: Article
Language:English
Subjects:
Astronomy
Clusters
Dispersion
Dispersions
Environmental impact
Fossils
Galaxies
Halos
Iron
Satellites
Spiders
Star formation
Stars & galaxies
Velocity
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Summary:A detailed analysis of how environment affects the star formation history of early-type galaxies (ETGs) is undertaken via high signal-to-noise ratio stacked spectra obtained from a sample of 20 977 ETGs (morphologically selected) from the Sloan Digital Sky Survey-based SPIDER survey. Two major parameters are considered for the study: the central velocity dispersion (...), which relates to local drivers of star formation, and the mass of the host halo, which relates to environment-related effects. In addition, we separate the sample between centrals (the most massive galaxy in a halo) and satellites. We derive trends of age, metallicity, and [ alpha /Fe] enhancement, with ... We confirm that the major driver of stellar population properties in ETGs is velocity dispersion, with a second-order effect associated with the central/satellite nature of the galaxy. No environmental dependence is detected for satellite ETGs, except at low ... - where satellites in groups or in the outskirts of clusters tend to be younger than those in the central regions of clusters. In contrast, the trends for centrals show a significant dependence on halo mass. Central ETGs in groups (i.e. with a halo mass >10... M...) have younger ages, lower [ alpha /Fe], and higher internal reddening, than 'isolated' systems (i.e. centrals residing in low-mass,
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stu1626