Dr Fiorenzo Vincenzo F.Vincenzo@hull.ac.uk
Lecturer in Astrophysics
On the [$\alpha$/Fe]-[Fe/H] relations in early-type galaxies
Vincenzo, Fiorenzo; Kobayashi, Chiaki; Taylor, Philip
Authors
Chiaki Kobayashi
Philip Taylor
Abstract
We study how the predicted [$\alpha$/Fe]-[Fe/H] relations in early-type galaxies vary as functions of their stellar masses, ages and stellar velocity dispersions, by making use of cosmological chemodynamical simulations with feedback from active galactic nuclei. Our model includes a detailed treatment for the chemical enrichment from dying stars, core-collapse supernovae (both Type II and hypernovae) and Type Ia supernovae. At redshift $z=0$, we create a catalogue of $526$ galaxies, among which we determine $80$ early-type galaxies. From the analysis of our simulations, we find [$\alpha$/Fe]-[Fe/H] relations similar to the Galactic bulge. We also find that, in the oldest galaxies, Type Ia supernovae start to contribute at higher [Fe/H] than in the youngest ones. On the average, early-type galaxies with larger stellar masses (and, equivalently, higher stellar velocity dispersions) have higher [$\alpha$/Fe] ratios, at fixed [Fe/H]. This is qualitatively consistent with the recent observations of Sybilska et al., but quantitatively there are mismatches, which might require stronger feedback, sub-classes of Type Ia Supernovae, or a variable initial mass function to address.
Citation
Vincenzo, F., Kobayashi, C., & Taylor, P. (2018). On the [$\alpha$/Fe]-[Fe/H] relations in early-type galaxies. Monthly Notices of the Royal Astronomical Society: Letters, 480(1), L38–L42. https://doi.org/10.1093/mnrasl/sly128
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 7, 2018 |
Online Publication Date | Jul 12, 2018 |
Publication Date | 2018-10 |
Deposit Date | Mar 12, 2022 |
Publicly Available Date | Mar 28, 2022 |
Journal | Monthly Notices of the Royal Astronomical Society: Letters |
Print ISSN | 1745-3933 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 480 |
Issue | 1 |
Pages | L38–L42 |
DOI | https://doi.org/10.1093/mnrasl/sly128 |
Keywords | Astrophysics of Galaxies |
Public URL | https://hull-repository.worktribe.com/output/3946268 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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