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Dissecting the Phase Space Snail Shell

文献类型：期刊论文

作者Li, Zhao-Yu1,2,3; Shen, Juntai1,2,3,4
刊名ASTROPHYSICAL JOURNAL
出版日期2020-02-10
卷号890期号:1页码:14
ISSN号0004-637X
DOI10.3847/1538-4357/ab6b21
英文摘要The ongoing vertical phase-mixing, manifesting itself as a snail shell in the Z - V-Z phase space, has been discovered with Gaia DR2 data. To better understand the origin and properties of the phase-mixing process, we study the vertical phase-mixing signatures in arches (including the classical "moving groups") of the V-R - V-phi phase space near the solar circle. Interestingly, the phase space snail shell exists only in the arches with vertical bar V-phi - V-LSR vertical bar less than or similar to 30 km s(-1), i.e., stars on dynamically "colder" orbits. The snail shell becomes much weaker and eventually disappears for increasingly larger radial action (J(R)), quantifying the "hotness" of orbits. Thus, one should pay closer attention to the colder orbits in future phase-mixing studies. We also confirm that the Hercules stream has two branches (at fast and slow V-phi), which may not be explained by a single mechanism, since only the fast branch shows the prominent snail shell feature. The hotter orbits may have phase-wrapped away already due to the much larger dynamical range in radial variation to facilitate faster phase-mixing. To explain the lack of a well-defined snail shell in the hotter orbits, the disk should have been perturbed at least 500 Myr ago. Our results offer more support to the recent satellite-disk encounter scenario than the internal bar-buckling perturbation scenario as the origin of the phase space mixing. The origin of the more prominent snail shell in the V-phi color-coded phase space is also discussed.
WOS关键词OUTER LINDBLAD RESONANCE ; LARGE-MAGELLANIC-CLOUD ; MILKY-WAY ; GALACTIC DISKS ; DENSITY WAVES ; SPIRAL ARMS ; LOCAL DISC ; KINEMATICS ; BAR ; SAGITTARIUS
资助项目National Key R&D Program of China[2018YFA0404501] ; National Natural Science Foundation of China[11773052] ; National Natural Science Foundation of China[11761131016] ; National Natural Science Foundation of China[11333003] ; "111" Project of the Ministry of Education[B20019] ; Youth Innovation Promotion Association ; Key Lab of Computational Astrophysics, Chinese Academy of Sciences ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; NSF[PHY-1748958]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000522096700017
出版者IOP PUBLISHING LTD
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Key Lab of Computational Astrophysics, Chinese Academy of Sciences ; Key Lab of Computational Astrophysics, Chinese Academy of Sciences ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; NSF ; NSF ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Key Lab of Computational Astrophysics, Chinese Academy of Sciences ; Key Lab of Computational Astrophysics, Chinese Academy of Sciences ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; NSF ; NSF ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Key Lab of Computational Astrophysics, Chinese Academy of Sciences ; Key Lab of Computational Astrophysics, Chinese Academy of Sciences ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; NSF ; NSF ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Key Lab of Computational Astrophysics, Chinese Academy of Sciences ; Key Lab of Computational Astrophysics, Chinese Academy of Sciences ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; NSF ; NSF
源URL[http://ir.bao.ac.cn/handle/114a11/55511]  
专题中国科学院国家天文台
通讯作者Li, Zhao-Yu
作者单位1.Shanghai Jiao Tong Univ, Sch Phys & Astron, Dept Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
2.Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
4.Univ Chinese Acad Sci, Coll Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Li, Zhao-Yu,Shen, Juntai. Dissecting the Phase Space Snail Shell[J]. ASTROPHYSICAL JOURNAL,2020,890(1):14.
APA Li, Zhao-Yu,&Shen, Juntai.(2020).Dissecting the Phase Space Snail Shell.ASTROPHYSICAL JOURNAL,890(1),14.
MLA Li, Zhao-Yu,et al."Dissecting the Phase Space Snail Shell".ASTROPHYSICAL JOURNAL 890.1(2020):14.

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来源：国家天文台

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