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Verfasst von:Şen, Şeyda [VerfasserIn]   i
 Lisker, Thorsten [VerfasserIn]   i
Titel:Abundance ratios in dwarf elliptical galaxies
Verf.angabe:Ş Şen, R.F. Peletier, A. Boselli, M. den Brok, J. Falcón-Barroso, G. Hensler, J. Janz, E. Laurikainen, T. Lisker, J.J. Mentz, S. Paudel, H. Salo, A. Sybilska, E. Toloba, G. van de Ven, A. Vazdekis and C. Yesilyaprak
E-Jahr:2018
Jahr:April 2018
Umfang:14 S.
Fussnoten:Online veröffentlicht am 20. Dezember 2017 ; Gesehen am 16.03.2018
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
Ort Quelle:Oxford : Oxford Univ. Press, 1827
Jahr Quelle:2018
Band/Heft Quelle:475(2018), 3, Seite 3453-3466
ISSN Quelle:1365-2966
Abstract: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.
DOI:doi:10.1093/mnras/stx3254
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: http://dx.doi.org/10.1093/mnras/stx3254
 kostenfrei: Volltext: https://academic.oup.com/mnras/article/475/3/3453/4768272
 DOI: https://doi.org/10.1093/mnras/stx3254
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1571141200
Verknüpfungen:→ Zeitschrift

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