PMO OpenIR
Angular momentum evolution of bulge stars in disc galaxies in NIHAO
Wang, Liang1; Obreschkow, Danail1; Lagos, Claudia del P.1,2; Sweet, Sarah M.3; Fisher, Deanne3; Glazebrook, Karl3; Maccio, Andrea V.4,5; Dutton, Aaron A.4; Kang, Xi6
2019-02-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume482Issue:4Pages:5477-5491
Corresponding AuthorWang, Liang(liang.wang@uwa.edu.au)
AbstractWe study the origin of bulge stars and their angular momentum (AM) evolution in 10 spiral galaxies with baryonic masses above 10(10) M-circle dot in the Numerical Investigation of a Hundred Astrophysical Objects galaxy formation simulations. The simulated galaxies are in good agreement with observations of the relation between the specific AM and mass of the baryonic component and the stellar bulge-to-total ratio (B/T). We divide the star particles at z = 0 into disc and bulge components using a hybrid photometric/kinematic decomposition method that identifies all the central mass above an exponential disc profile as the 'bulge'. By tracking the bulge star particles back in time, we find that on average 95 per cent of the bulge stars formed in situ, 3 per cent formed ex situ in satellites of the same halo, and only 2 per cent formed ex situ in external galaxies. The evolution of the AM distribution of the bulge stars paints an interesting picture: The higher the final B/T, the more the specific AM remains preserved during the bulge formation. In all cases, bulge stars migrate significantly towards the central region, reducing their average galactocentric radius by roughly a factor 2, independently of the final B/T value. However, in the higher B/T (greater than or similar to 0.2) objects, the velocity of the bulge stars increases and the AM of the bulge is almost conserved, whereas at lower B/T values, the velocity of the bulge stars decreases and the AM of the bulge reduces. The correlation between the evolution of the AM and B/T suggests that bulge formation and disc formation are closely linked and cannot be treated as independent processes.
Keywordmethods: numerical galaxies: bulges galaxies: evolution galaxies: formation galaxies: kinematics and dynamics galaxies: spiral
DOI10.1093/mnras/sty3010
WOS KeywordCOSMOLOGICAL SIMULATIONS ; FEEDBACK ; MATTER ; DARK ; PROJECT ; DYNAMICS ; ORIGIN ; HALO ; GAS ; PSEUDOBULGES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000462327300091
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24211
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Liang
Affiliation1.Univ Western Australia, Int Ctr Radio Astron Res ICRAR, M468,35 Stirling Hwy, Crawley, WA 6009, Australia
2.Swinburne Univ Technol, ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, POB 218, Hawthorn, Vic 3122, 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.Partner Grp MPI Astron, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wang, Liang,Obreschkow, Danail,Lagos, Claudia del P.,et al. Angular momentum evolution of bulge stars in disc galaxies in NIHAO[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,482(4):5477-5491.
APA Wang, Liang.,Obreschkow, Danail.,Lagos, Claudia del P..,Sweet, Sarah M..,Fisher, Deanne.,...&Kang, Xi.(2019).Angular momentum evolution of bulge stars in disc galaxies in NIHAO.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,482(4),5477-5491.
MLA Wang, Liang,et al."Angular momentum evolution of bulge stars in disc galaxies in NIHAO".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 482.4(2019):5477-5491.
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