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A Universe of ultradiffuse galaxies: theoretical predictions from I > CDM simulations
Rong, Yu1; Guo, Qi1; Gao, Liang1,2; Liao, Shihong1; Xie, Lizhi3; Puzia, Thomas H.4; Sun, Shuangpeng1; Pan, Jun1
2017-10-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号470期号:4页码:4231-4240
摘要A particular population of galaxies have drawn much interest recently, which are as faint as typical dwarf galaxies but have the sizes as large as L* galaxies, the so called ultradiffuse galaxies (UDGs). The lack of tidal features of UDGs in dense environments suggests that their host haloes are perhaps as massive as that of the Milky Way. On the other hand, galaxy formation efficiency should be much higher in the haloes of such masses. Here, we use the model galaxy catalogue generated by populating two large simulations: the Millennium-II cosmological simulation and Phoenix simulations of nine big clusters with the semi-analytic galaxy formation model. This model reproduces remarkably well the observed properties of UDGs in the nearby clusters, including the abundance, profile, colour and morphology, etc. We search for UDG candidates using the public data and find two UDG candidates in our Local Group and 23 in our Local Volume, in excellent agreement with the model predictions. We demonstrate that UDGs are genuine dwarf galaxies, formed in the haloes of similar to 10(10) M-circle dot. It is the combination of the late formation time and high spins of the host haloes that results in the spatially extended feature of this particular population. The lack of tidal disruption features of UDGs in clusters can also be explained by their late infall-time.
文章类型Article
关键词Methods: Numerical Galaxies: Evolution Galaxies: Stellar Content
WOS标题词Science & Technology ; Physical Sciences
资助者NSFC(11425312 ; NSFC(11425312 ; FONDECYT(1161817) ; FONDECYT(1161817) ; BASAL Center for Astrophysics and Associated Technologies(PFB-06) ; BASAL Center for Astrophysics and Associated Technologies(PFB-06) ; National Basic Research Program of China (program 973)(2015CB857001) ; National Basic Research Program of China (program 973)(2015CB857001) ; 11573030) ; 11573030) ; NSFC(11425312 ; NSFC(11425312 ; FONDECYT(1161817) ; FONDECYT(1161817) ; BASAL Center for Astrophysics and Associated Technologies(PFB-06) ; BASAL Center for Astrophysics and Associated Technologies(PFB-06) ; National Basic Research Program of China (program 973)(2015CB857001) ; National Basic Research Program of China (program 973)(2015CB857001) ; 11573030) ; 11573030)
DOI10.1093/mnras/stx1440
关键词[WOS]ULTRA-DIFFUSE GALAXIES ; STAR-FORMATION ; DARK-MATTER ; COSMIC TIME ; LAMBDA-CDM ; MASS ; POPULATION ; CLUSTERS ; DWARF ; COMA
收录类别SCI
语种英语
资助者NSFC(11425312 ; NSFC(11425312 ; FONDECYT(1161817) ; FONDECYT(1161817) ; BASAL Center for Astrophysics and Associated Technologies(PFB-06) ; BASAL Center for Astrophysics and Associated Technologies(PFB-06) ; National Basic Research Program of China (program 973)(2015CB857001) ; National Basic Research Program of China (program 973)(2015CB857001) ; 11573030) ; 11573030) ; NSFC(11425312 ; NSFC(11425312 ; FONDECYT(1161817) ; FONDECYT(1161817) ; BASAL Center for Astrophysics and Associated Technologies(PFB-06) ; BASAL Center for Astrophysics and Associated Technologies(PFB-06) ; National Basic Research Program of China (program 973)(2015CB857001) ; National Basic Research Program of China (program 973)(2015CB857001) ; 11573030) ; 11573030)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000408207600032
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/20136
专题星系宇宙学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, Partner Grp,Max Planck Inst Astrophys, Beijing 100012, Peoples R China
2.Univ Durham, Inst Computat Cosmol, Dept Phys, Sci Labs, South Rd, Durham DH1 3LE, England
3.INAF, OATS, Via Bazzoni 2, I-34124 Trieste, TS, Italy
4.Pontificia Univ Catolica Chile, Inst Astrofis, Ave Vicuna Mackenna 4860, Santiago 7820436, Chile
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Rong, Yu,Guo, Qi,Gao, Liang,et al. A Universe of ultradiffuse galaxies: theoretical predictions from I > CDM simulations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,470(4):4231-4240.
APA Rong, Yu.,Guo, Qi.,Gao, Liang.,Liao, Shihong.,Xie, Lizhi.,...&Pan, Jun.(2017).A Universe of ultradiffuse galaxies: theoretical predictions from I > CDM simulations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,470(4),4231-4240.
MLA Rong, Yu,et al."A Universe of ultradiffuse galaxies: theoretical predictions from I > CDM simulations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470.4(2017):4231-4240.
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