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The metal enrichment of passive galaxies in cosmological simulations of galaxy formation

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Title: The metal enrichment of passive galaxies in cosmological simulations of galaxy formation
Authors: Okamoto, Takashi Browse this author →KAKEN DB
Nagashima, Masahiro Browse this author
Lacey, Cedric G. Browse this author
Frenk, Carlos S. Browse this author
Keywords: methods: numerical
galaxies: evolution
galaxies: formation
Issue Date: Feb-2017
Publisher: Oxford University Press
Journal Title: Monthly notices of the royal astronomical society
Volume: 464
Issue: 4
Start Page: 4866
End Page: 4874
Publisher DOI: 10.1093/mnras/stw2729
Abstract: Massive early-type galaxies have higher metallicities and higher ratios of a elements to iron than their less massive counterparts. Reproducing these correlations has long been a problem for hierarchical galaxy formation theory, both in semi-analytic models and cosmological hydrodynamic simulations. We show that a simulation in which gas cooling in massive dark haloes is quenched by radio-mode active galactic nuclei (AGNs) feedback naturally reproduces the observed trend between alpha/Fe and the velocity dispersion of galaxies, sigma. The quenching occurs earlier for more massive galaxies. Consequently, these galaxies complete their star formation before a/Fe is diluted by the contribution from Type Ia supernovae. For galaxies more massive than similar to 10(11)M(circle dot), whose alpha/Fe correlates positively with stellar mass, we find an inversely correlated mass-metallicity relation. This is a common problem in simulations in which star formation in massive galaxies is quenched either by quasar- or radio-mode AGN feedback. The early suppression of gas cooling in progenitors of massive galaxies prevents them from recapturing enriched gas ejected as winds. Simultaneously reproducing the [alpha/Fe]-sigma relation and the mass-metallicity relation is, thus, difficult in the current framework of galaxy formation.
Rights: This article has been accepted for publication in Monthly notices of the royal astronomical society © 2016 The Authors Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 岡本 崇

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