ar X iv : a st ro - p h / 06 02 32 2 v 1 1 4 Fe b 20 06 Star Formation Histories of Nearby Elliptical Galaxies
نویسنده
چکیده
This work presents high S/N spectroscopic observations of a sample of six suspected merger remnants, selected primarily on the basis of Hi tidal debris detections. Single stellar population analysis of these galaxies indicates that their ages, metallicities, and α-enhancement ratios are consistent with those of a representative sample of nearby elliptical galaxies. The expected stellar population of a recent merger remnant, young age combined with low [α/Fe], is not seen in any Hi-selected galaxy. However, one galaxy (NGC 2534), is found to deviate from the Z-plane in the sense expected for a merger remnant. Another galaxy (NGC 7332), selected by other criteria, best matches the merger remnant expectations. Subject headings: galaxies: elliptical and lenticular, cD — galaxies: abundances — galaxies: stellar content — galaxies: formation — galaxies: evolution — galaxies: interactions — galaxies: general
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