@Article{RosaMiloKrabRodr:2018:StPoSp,
author = "Rosa, Deise Aparecida and Milone, Andre de Castro and Krabbe,
Angela C. and Rodrigues, Irapuan",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade do Vale
do Para{\'{\i}}ba (UNIVAP)} and {Universidade do Vale do
Para{\'{\i}}ba (UNIVAP)}",
title = "Eight luminous early-type galaxies in nearby pairs and sparse
groups. I. Stellar populations spatially analysed",
journal = "Astrophysics and Space Science",
year = "2018",
volume = "363",
number = "131",
pages = "1--29",
note = "{Setores de Atividade: Pesquisa e desenvolvimento
cient{\'{\i}}fico.}",
keywords = "galaxies: elliptical and lenticular, cD, galaxies: groups:
general, galaxies: stellar content, galaxies: abundances,
galaxies: kinematics and dynamic, galaxies: formation.",
abstract = "We present a detailed spatial analysis of stellar populations
based on long-slit optical spectra in a sample of eight luminous
early-type galaxies selected from nearby sparse groups and pairs,
three of them may have interaction with another galaxy of similar
mass. We have spatially measured luminosityweighted averages of
age, [M/H], [Fe/H], and [\α/Fe] in the sample galaxies to
add empirical data relative to the influence of galaxy mass,
environment, interaction, and AGN feedback in their formation and
evolution. The stellar population of the individual galaxies were
determined through the well-established stellar population
synthesis code STARLIGHT using semi-empirical simple stellar
population models. Radial variations of luminosity- weighted means
of age, [M/H], [Fe/H], and [\α/Fe] were quantified up to
half of the effective radius of each galaxy. We found trends
between representative values of age, [M/H], [\α/Fe], and
the nuclear stellar velocity dispersion. There are also relations
between the metallicity/age gradients and the velocity dispersion.
Contributions of 1 \− 4 Gyr old stellar populations were
quantified in IC 5328 and NGC 6758 as well as 4\−8 Gyr old
ones in NGC 5812. Extended gas is present in IC 5328, NGC 1052,
NGC 1209, and NGC 6758, and the presence of a LINER is identified
in all these galaxies. The regions up to one effective radius of
all galaxies are basically dominated by \α-enhanced
metal-rich old stellar populations likely due to rapid star
formation episodes that induced efficient chemical enrichment. On
average, the age and [\α/Fe] gradients are null and the
[M/H] gradients are negative, although discordant cases were
found. We found no correlation between the stellar population
properties and the LINER presence as well as between the stellar
properties and environment or gravitational interaction,
suggesting that the influence of progenitor mass can-not be
discarded in the formation and evolution of early-type galaxies.",
doi = "10.1007/s10509-018-3353-7",
url = "http://dx.doi.org/10.1007/s10509-018-3353-7",
issn = "0004-640X",
label = "lattes: 8944689376916651 2 RosaMiloKrabRodr:2018:StPoSp",
language = "en",
targetfile = "rosa_eight.pdf",
url = "https://link.springer.com/article/10.1007%2Fs10509-018-3353-7",
urlaccessdate = "27 abr. 2024"
}