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A chronicle of galaxy mass assembly in the EAGLE simulation
Qu, Yan1; Helly, John C.2; Bower, Richard G.2; Theuns, Tom2; Crain, Robert A.3; Frenk, Carlos S.2; Furlong, Michelle2; McAlpine, Stuart2; Schaller, Matthieu2; Schaye, Joop4; White, Simon D. M.5
2017
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume464Issue:2Pages:1659-1675
AbstractWe analyse the mass assembly of central galaxies in the Evolution and Assembly of Galaxies and their Environments (EAGLE) hydrodynamical simulations. We build merger trees to connect galaxies to their progenitors at different redshifts and characterize their assembly histories by focusing on the time when half of the galaxy stellar mass was assembled into the main progenitor. We show that galaxies with stellar mass M-* < 10(10.5) M-circle dot assemble most of their stellar mass through star formation in the main progenitor ('in situ' star formation). This can be understood as a consequence of the steep rise in star formation efficiency with halo mass for these galaxies. For more massive galaxies, however, an increasing fraction of their stellar mass is formed outside the main progenitor and subsequently accreted. Consequently, while for low-mass galaxies, the assembly time is close to the stellar formation time, the stars in high-mass galaxies typically formed long before half of the present-day stellar mass was assembled into a single object, giving rise to the observed antihierarchical downsizing trend. In a typical present-day M-* >= 10(11) M-circle dot galaxy, around 20 per cent of the stellar mass has an external origin. This fraction decreases with increasing redshift. Bearing in mind that mergers only make an important contribution to the stellar mass growth of massive galaxies, we find that the dominant contribution comes from mergers with galaxies of mass greater than one-tenth of the main progenitor's mass. The galaxy merger fraction derived from our simulations agrees with recent observational estimates.
SubtypeArticle
KeywordGalaxies: Evolution Galaxies: Formation Galaxies: High-redshift Galaxies: Interactions Galaxies: Stellar Content
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationSTFC(ST/L00075X/1 ; STFC(ST/L00075X/1 ; BIS National E-infrastructure capital grant(ST/K00042X/1) ; BIS National E-infrastructure capital grant(ST/K00042X/1) ; STFC DiRAC Operations grant(ST/K003267/1) ; STFC DiRAC Operations grant(ST/K003267/1) ; Durham University ; Durham University ; Interuniversity Attraction Poles Programme ; Interuniversity Attraction Poles Programme ; Belgian Science Policy Office(AP P7/08 CHARM) ; Belgian Science Policy Office(AP P7/08 CHARM) ; European Research Council(GA 267291 ; European Research Council(GA 267291 ; ST/H008519/1 ; ST/H008519/1 ; 278594-GasAroundGalaxies) ; 278594-GasAroundGalaxies) ; ST/F001166/1) ; ST/F001166/1) ; STFC(ST/L00075X/1 ; STFC(ST/L00075X/1 ; BIS National E-infrastructure capital grant(ST/K00042X/1) ; BIS National E-infrastructure capital grant(ST/K00042X/1) ; STFC DiRAC Operations grant(ST/K003267/1) ; STFC DiRAC Operations grant(ST/K003267/1) ; Durham University ; Durham University ; Interuniversity Attraction Poles Programme ; Interuniversity Attraction Poles Programme ; Belgian Science Policy Office(AP P7/08 CHARM) ; Belgian Science Policy Office(AP P7/08 CHARM) ; European Research Council(GA 267291 ; European Research Council(GA 267291 ; ST/H008519/1 ; ST/H008519/1 ; 278594-GasAroundGalaxies) ; 278594-GasAroundGalaxies) ; ST/F001166/1) ; ST/F001166/1)
DOI10.1093/mnras/stw2437
WOS KeywordDARK-MATTER HALOES ; LAMBDA-CDM COSMOLOGY ; STAR-FORMATION HISTORIES ; MAJOR MERGER RATE ; HIERARCHICAL UNIVERSE ; STELLAR MASS ; ILLUSTRIS SIMULATION ; DISTANT GALAXIES ; FORMATION MODELS ; MERGING HISTORY
Indexed BySCI
Language英语
Funding OrganizationSTFC(ST/L00075X/1 ; STFC(ST/L00075X/1 ; BIS National E-infrastructure capital grant(ST/K00042X/1) ; BIS National E-infrastructure capital grant(ST/K00042X/1) ; STFC DiRAC Operations grant(ST/K003267/1) ; STFC DiRAC Operations grant(ST/K003267/1) ; Durham University ; Durham University ; Interuniversity Attraction Poles Programme ; Interuniversity Attraction Poles Programme ; Belgian Science Policy Office(AP P7/08 CHARM) ; Belgian Science Policy Office(AP P7/08 CHARM) ; European Research Council(GA 267291 ; European Research Council(GA 267291 ; ST/H008519/1 ; ST/H008519/1 ; 278594-GasAroundGalaxies) ; 278594-GasAroundGalaxies) ; ST/F001166/1) ; ST/F001166/1) ; STFC(ST/L00075X/1 ; STFC(ST/L00075X/1 ; BIS National E-infrastructure capital grant(ST/K00042X/1) ; BIS National E-infrastructure capital grant(ST/K00042X/1) ; STFC DiRAC Operations grant(ST/K003267/1) ; STFC DiRAC Operations grant(ST/K003267/1) ; Durham University ; Durham University ; Interuniversity Attraction Poles Programme ; Interuniversity Attraction Poles Programme ; Belgian Science Policy Office(AP P7/08 CHARM) ; Belgian Science Policy Office(AP P7/08 CHARM) ; European Research Council(GA 267291 ; European Research Council(GA 267291 ; ST/H008519/1 ; ST/H008519/1 ; 278594-GasAroundGalaxies) ; 278594-GasAroundGalaxies) ; ST/F001166/1) ; ST/F001166/1)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000393647100029
Citation statistics
Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8276
Collection星系宇宙学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 10012, Peoples R China
2.Univ Durham, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England
3.Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
4.Leiden Univ, Leiden Observ, Postbus 9513, NL-2300 RA Leiden, Netherlands
5.Max Planck Inst Astrophys, Karl Schwarzschild Strae 1, D-85741 Garching, Germany
Recommended Citation
GB/T 7714
Qu, Yan,Helly, John C.,Bower, Richard G.,et al. A chronicle of galaxy mass assembly in the EAGLE simulation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,464(2):1659-1675.
APA Qu, Yan.,Helly, John C..,Bower, Richard G..,Theuns, Tom.,Crain, Robert A..,...&White, Simon D. M..(2017).A chronicle of galaxy mass assembly in the EAGLE simulation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,464(2),1659-1675.
MLA Qu, Yan,et al."A chronicle of galaxy mass assembly in the EAGLE simulation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 464.2(2017):1659-1675.
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