Stellar Populations in Nearby Lenticular Galaxiesстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We have obtained 2D spectral data for a sample of 58 nearby S0 galaxies
with the Multi-Pupil Spectrograph of the 6m telescope of the Special
Astrophysical Observatory of the Russian Academy of Sciences. The Lick
indices H-beta, Mgb, and <Fe> are calculated separately
for the nuclei and for the bulges taken as the rings between R=4" and
7"; and the luminosity-weighted ages, metallicities, and Mg/Fe ratios
of the stellar populations are estimated by confronting the data to SSP models.
Four types of galaxy environments are considered: clusters, centers
of groups, other places in groups, and field. The nuclei are found to be
on average slightly younger than the bulges in any types of environments,
and the bulges of S0s in sparse environments are younger than those in dense
environments. The effect can be partly attributed to the well-known age
correlation with the stellar velocity dispersion in early-type galaxies
(in our sample the galaxies in sparse environements are in average less
massive than those in dense environments), but for the most massive S0s,
with the stellar velocity dispersion of 170-220 km/s, the age dependence
on the environment s still significant at the confidence level of 1.5 sigma.