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NIHAO VI. The hidden discs of simulated galaxies
Obreja, Aura1,2; Stinson, Gregory S.2; Dutton, Aaron A.1,2; Maccio, Andrea V.1,2; Wang, Liang2,3,4; Kang, Xi3,4
2016-06-11
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume459Issue:1Pages:467-486
AbstractDetailed studies of galaxy formation require clear definitions of the structural components of galaxies. Precisely defined components also enable better comparisons between observations and simulations. We use a subsample of 18 cosmological zoom-in simulations from the Numerical Investigation of a Hundred Astrophysical Objects (NIHAO) project to derive a robust method for defining stellar kinematic discs in galaxies. Our method uses Gaussian Mixture Models in a 3D space of dynamical variables. The NIHAO galaxies have the right stellar mass for their halo mass, and their angular momenta and Sersic indices match observations. While the photometric disc-to-total ratios are close to 1 for all the simulated galaxies, the kinematic ratios are around similar to 0.5. Thus, exponential structure does not imply a cold kinematic disc. Above M-* similar to 10(9.5) M-circle dot, the decomposition leads to thin discs and spheroids that have clearly different properties, in terms of angular momentum, rotational support, ellipticity, [Fe/H] and [O/Fe]. At M-* less than or similar to 10(9.5) M-circle dot, the decomposition selects discs and spheroids with less distinct properties. At these low masses, both the discs and spheroids have exponential profiles with high minor-to-major axes ratios, i.e. thickened discs.
KeywordMethods: Numerical Galaxies: Fundamental Parameters Galaxies: Kinematics And Dynamics Galaxies: Stellar Content Galaxies: Structure
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stw690
WOS KeywordSMOOTHED-PARTICLE HYDRODYNAMICS ; DARK-MATTER UNIVERSE ; EDGE-ON GALAXIES ; STELLAR FEEDBACK ; SPIRAL GALAXIES ; GALACTIC DISKS ; MINOR MERGERS ; THICK DISKS ; ELLIPTIC GALAXIES ; ANGULAR-MOMENTUM
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000376386600037
Citation statistics
Cited Times:29[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16220
Collection南极天文中心
Affiliation1.New York Univ Abu Dhabi, POB 129188, Abu Dhabi, U Arab Emirates
2.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
3.Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China
4.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Obreja, Aura,Stinson, Gregory S.,Dutton, Aaron A.,et al. NIHAO VI. The hidden discs of simulated galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,459(1):467-486.
APA Obreja, Aura,Stinson, Gregory S.,Dutton, Aaron A.,Maccio, Andrea V.,Wang, Liang,&Kang, Xi.(2016).NIHAO VI. The hidden discs of simulated galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,459(1),467-486.
MLA Obreja, Aura,et al."NIHAO VI. The hidden discs of simulated galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 459.1(2016):467-486.
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