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

MNRAS464 4866–4874.pdf1.83 MBPDF見る/開く

タイトル: The metal enrichment of passive galaxies in cosmological simulations of galaxy formation
著者: Okamoto, Takashi 著作を一覧する
Nagashima, Masahiro 著作を一覧する
Lacey, Cedric G. 著作を一覧する
Frenk, Carlos S. 著作を一覧する
キーワード: methods: numerical
galaxies: evolution
galaxies: formation
発行日: 2017年 2月
出版者: Oxford University Press
誌名: Monthly notices of the royal astronomical society
巻: 464
号: 4
開始ページ: 4866
終了ページ: 4874
出版社 DOI: 10.1093/mnras/stw2729
抄録: 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.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 岡本 崇


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