PMO OpenIR
Dynamic Equilibrium Sets of the Atomic Content of Galaxies across Cosmic Time
Wang, Liang1; Obreschkow, Danail1; Lagos, Claudia D. P.1,2; Sweet, Sarah M.3; Fisher, Deanne B.3; Glazebrook, Karl3; Maccio, Andrea V.4,5; Dutton, Aaron A.4; Kang, Xi6
2018-12-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume868Issue:2Pages:9
Abstract

We analyze 88 independent, high-resolution, cosmological zoomed-in simulations of disk galaxies in the NIHAO simulations suite to explore the connection between the atomic gas fraction and angular momentum (AM) of baryons throughout cosmic time. The study is motivated by the analytical model of Obreschkow et al., which predicts a relation between the atomic gas fraction f(atm) and the integrated atomic stability parameter q = j sigma/(GM), where M and j are the mass and specific AM of the galaxy (stars+cold gas) and sigma is the velocity dispersion of the atomic gas. We show that the simulated galaxies follow this relation from their formation (z similar or equal to 4) to the present within similar to 0.5 dex. To explain this behavior, we explore the evolution of the local Toomre stability and find that 90%-100% of the atomic gas in all simulated galaxies is stable at any time. In other words, throughout the entire epoch of peak star formation until today, the timescale for accretion is longer than the timescale to reach equilibrium, thus resulting in a quasi-static equilibrium of atomic gas at any time. Hence, the evolution of f(atm) depends on the complex hierarchical growth history primarily via the evolution of q. An exception is galaxies subject to strong environmental effects.

Keywordgalaxies: dwarf galaxies: evolution galaxies: formation galaxies: spiral methods: numerical
DOI10.3847/1538-4357/aae8de
WOS KeywordARECIBO SDSS SURVEY ; STAR-FORMATION-RATE ; COLD DARK-MATTER ; NEUTRAL HYDROGEN ; H I ; STABILITY PARAMETER ; FORMATION LAW ; GAS CONTENT ; EVOLUTION ; FEEDBACK
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000451432300006
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/20658
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Liang
Affiliation1.Univ Western Australia, ICRAR, M468,35 Stirling Hwy, Crawley, WA 6009, Australia
2.ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Crawley, WA, Australia
3.Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia
4.New York Univ Abu Dhabi, POB 129188, Abu Dhabi, U Arab Emirates
5.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
6.Purple Mt Observ, Partner Grp MPI Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wang, Liang,Obreschkow, Danail,Lagos, Claudia D. P.,et al. Dynamic Equilibrium Sets of the Atomic Content of Galaxies across Cosmic Time[J]. ASTROPHYSICAL JOURNAL,2018,868(2):9.
APA Wang, Liang.,Obreschkow, Danail.,Lagos, Claudia D. P..,Sweet, Sarah M..,Fisher, Deanne B..,...&Kang, Xi.(2018).Dynamic Equilibrium Sets of the Atomic Content of Galaxies across Cosmic Time.ASTROPHYSICAL JOURNAL,868(2),9.
MLA Wang, Liang,et al."Dynamic Equilibrium Sets of the Atomic Content of Galaxies across Cosmic Time".ASTROPHYSICAL JOURNAL 868.2(2018):9.
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