The evolution of galaxy shapes in CANDELS: from prolate to discy

doi:10.1093/mnras/stz339

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	The evolution of galaxy shapes in CANDELS: from prolate to discy
	Zhang, Haowen 5,6; Primack, Joel R.7,8; Faber, S. M.9; Koo, David C.9; Dekel, Avishai 8,10; Chen, Zhu 11; Ceverino, Daniel 12; Chang, Yu-Yen 2; Fang, Jerome J.1; Guo, Yicheng 13
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-04-01
卷号	484 期号:4 页码:5170-5191
关键词	galaxies: evolution galaxies: formation galaxies: fundamental parameters
ISSN号	0035-8711
DOI	10.1093/mnras/stz339
英文摘要	We model the projected b/a-log a distributions of CANDELS star-forming main-sequence galaxies, where a (b) is the half-light semimajor (semiminor) axis of the galaxy images measured by GALFIT. We find that smaller a galaxies are rounder at all stellar masses M-* and redshifts, so we include a when analysing b/a distributions. Approximating intrinsic shapes of the galaxies as triaxial ellipsoids and assuming amultivariate normal distribution of galaxy size and two shape parameters, we construct their intrinsic shape and size distributions to obtain the fractions of elongated (prolate), discy (oblate), and spheroidal galaxies in each redshift and mass bin. We find that galaxies tend to be prolate at low M-* and high redshifts, and discy at high M-* and low redshifts, qualitatively consistent with van der Wel et al., implying that galaxies tend to evolve from prolate to discy. These results are consistent with the predictions from simulations that the transition from prolate to oblate is caused by a compaction event at a characteristic mass range, making the galaxy centre baryon dominated. We give probabilities of a galaxy's being elongated, discy, or spheroidal as a function of its M-*, redshift, and projected b/a and a, which can facilitate target selections of galaxies with specific shapes at high redshifts.
资助项目	China Scholarship Council ; Fujian Fuguang Foundation ; US-Israel BSF[2014-273] ; GIF[I-1341-303.7/2016] ; NSF[AST-1405962] ; NSF[DIP STE1869/2-1 GE625/17-1] ; NASA through a grant from the Space Telescope Science Institute[HST-AR-15025] ; NASA through a grant from the Space Telescope Science Institute[NAS5-26555] ; NASA through a grant from the Space Telescope Science Institute[HST-GO-12060] ; ERC Advanced Grant, STARLIGHT: Formation of the First Stars[339177] ; [HST-AR-14578.001-A] ; [NSF-AST-1615730]
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000462414400052
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31855]
专题	中国科学院上海天文台
通讯作者	Zhang, Haowen
作者单位	1.Orange Coast Coll, Costa Mesa, CA 92626 USA 2.Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan 3.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 4.Univ Ghent, Sterrenkundig Observatorium, Krijgslaan 281 S9, B-9000 Ghent, Belgium 5.Peking Univ, Sch Phys, Beijing 100871, Peoples R China 6.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 7.Univ Calif Santa Cruz, Phys Dept, Santa Cruz, CA 95064 USA 8.Univ Calif Santa Cruz, SCIPP, Santa Cruz, CA 95064 USA 9.Univ Calif Santa Cruz, Dept Astron & Astrophys, UCO Lick Observ, Santa Cruz, CA 95064 USA 10.Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
推荐引用方式 GB/T 7714	Zhang, Haowen,Primack, Joel R.,Faber, S. M.,et al. The evolution of galaxy shapes in CANDELS: from prolate to discy[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,484(4):5170-5191.
APA	Zhang, Haowen.,Primack, Joel R..,Faber, S. M..,Koo, David C..,Dekel, Avishai.,...&van der Wel, Arjen.(2019).The evolution of galaxy shapes in CANDELS: from prolate to discy.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,484(4),5170-5191.
MLA	Zhang, Haowen,et al."The evolution of galaxy shapes in CANDELS: from prolate to discy".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 484.4(2019):5170-5191.