The Splash without a Merger

doi:10.3847/2041-8213/ab78a4

CORC > 国家天文台 > 中国科学院国家天文台

	The Splash without a Merger
	Amarante, Joao A. S.2; Beraldo e Silva, Leandro 1; Debattista, Victor P.1; Smith, Martin C.2
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2020-03-10
卷号	891 期号:2 页码:7
关键词	Milky Way dynamics Milky Way formation Hydrodynamical simulations Milky Way evolution
ISSN号	2041-8205
DOI	10.3847/2041-8213/ab78a4
英文摘要	The Milky Way's progenitor experienced several merger events that left their imprints on the stellar halo, including the Gaia-Sausage/Enceladus. Recently, it has been proposed that this event perturbed the proto-disk and gave rise to a metal-rich ([Fe/H] > -1), low angular momentum (v < 100 km s(-1)) stellar population. These stars have dynamical and chemical properties different from the accreted stellar halo, but are continuous with the canonical thick disk. In this Letter, we use a hydrodynamical simulation of an isolated galaxy that develops clumps that produce a bimodal thin+thick disk chemistry to explore whether it forms such a population. We demonstrate that clump scattering forms a metal-rich, low angular momentum population, without the need for a major merger. We show that, in the simulation, these stars have chemistry, kinematics, and density distribution in good agreement with those in the Milky Way.
资助项目	National Key Basic Research and Development Program of China[2018YFA0404501] ; NSFC[11673083] ; World Academy of Sciences ; Chinese Academy of Sciences ; STFC Consolidated grant[ST/R000786/1] ; BIS National E-infrastructure capital grant[ST/J005673/1] ; STFC capital grant[ST/H008586/1] ; STFC DiRAC Operations grant[ST/K00333X/1]
WOS关键词	STELLAR HALO ; MILKY-WAY ; GAIA ; DISKS ; AGES ; I.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000519102400001
资助机构	National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; World Academy of Sciences ; World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC Consolidated grant ; STFC Consolidated grant ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; STFC capital grant ; STFC capital grant ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; World Academy of Sciences ; World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC Consolidated grant ; STFC Consolidated grant ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; STFC capital grant ; STFC capital grant ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; World Academy of Sciences ; World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC Consolidated grant ; STFC Consolidated grant ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; STFC capital grant ; STFC capital grant ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; World Academy of Sciences ; World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC Consolidated grant ; STFC Consolidated grant ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; STFC capital grant ; STFC capital grant ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/54555]
专题	中国科学院国家天文台
通讯作者	Amarante, Joao A. S.
作者单位	1.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England 2.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Amarante, Joao A. S.,Beraldo e Silva, Leandro,Debattista, Victor P.,et al. The Splash without a Merger[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,891(2):7.
APA	Amarante, Joao A. S.,Beraldo e Silva, Leandro,Debattista, Victor P.,&Smith, Martin C..(2020).The Splash without a Merger.ASTROPHYSICAL JOURNAL LETTERS,891(2),7.
MLA	Amarante, Joao A. S.,et al."The Splash without a Merger".ASTROPHYSICAL JOURNAL LETTERS 891.2(2020):7.