SIMBAD references

2018MNRAS.475.3453S - Mon. Not. R. Astron. Soc., 475, 3453-3466 (2018/April-2)

Abundance ratios in dwarf elliptical galaxies.

SEN S., PELETIER R.F., BOSELLI A., DEN BROK M., FALCON-BARROSO J., HENSLER G., JANZ J., LAURIKAINEN E., LISKER T., MENTZ J.J., PAUDEL S., SALO H., SYBILSKA A., TOLOBA E., VAN DE VEN G., VAZDEKIS A. and YESILYAPRAK C.

Abstract (from CDS):

We determine abundance ratios of 37 dwarf ellipticals (dEs) in the nearby Virgo cluster. This sample is representative of the early-type population of galaxies in the absolute magnitude range -19.0 < Mr < -16.0. We analyse their absorption line-strength indices by means of index-index diagrams and scaling relations and use the stellar population models to interpret them. We present ages, metallicities, and abundance ratios obtained from these dEs within an aperture size of Re/8. We calculate [Na/Fe] from NaD, [Ca/Fe] from Ca4227, and [Mg/Fe] from Mgb. We find that [Na/Fe] is underabundant with respect to solar, whereas [Mg/Fe] is around solar. This is exactly opposite to what is found for giant ellipticals, but follows the trend with metallicity found previously for the Fornax dwarf NGC 1396. We discuss possible formation scenarios that can result in such elemental abundance patterns, and we speculate that dEs have disc-like star formation history (SFH) favouring them to originate from late-type dwarfs or small spirals. Na-yields appear to be very metal-dependent, in agreement with studies of giant ellipticals, probably due to the large dependence on the neutron-excess in stars. We conclude that dEs have undergone a considerable amount of chemical evolution, they are therefore not uniformly old, but have extended SFH, similar to many of the Local Group galaxies.

Abstract Copyright: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: abundances - galaxies: clusters: individual: Virgo - galaxies: dwarf - galaxies: evolution - galaxies: stellar content

Simbad objects: 45

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2018MNRAS.475.3453S and select 'bookmark this link' or equivalent in the popup menu


2019.09.23-20:55:00

© Université de Strasbourg/CNRS

    • Contact