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The echo of the bar buckling: Phase-space spirals in Gaia Data Release 2

文献类型：期刊论文

作者Khoperskov, Sergey1,2,3; Di Matteo, Paola2; Gerhard, Ortwin1; Katz, David2; Haywood, Misha2; Combes, Francoise4,5; Berczik, Peter6,7,8; Gomez, Ana2
刊名ASTRONOMY & ASTROPHYSICS
出版日期2019-01-30
卷号622页码:7
关键词galaxies: evolution galaxies: kinematics and dynamics Galaxy: disk Galaxy: kinematics and dynamics
ISSN号1432-0746
DOI10.1051/0004-6361/201834707
英文摘要We present a high-resolution numerical study of the phase-space diversity in an isolated Milky Way-type galaxy. Using a single N-body simulation (N approximate to 0.14 x 10(9)) we explore the formation, evolution, and spatial variation of the phase-space spirals similar to those recently discovered by Antoja et al. in the Milky Way disk with Gaia Data Release 2 (DR2). For the first time in the literature we use a self-consistent N-body simulation of an isolated Milky Way-type galaxy to show that the phase-space spirals develop naturally from vertical oscillations driven by the buckling of the stellar bar. Thus, we claim that the physical mechanism standing behind the observed incomplete phase-space mixing process can be internal and not necessarily due to the perturbation induced by a massive satellite. In our model, the bending oscillations propagate outward and produce axisymmetric variations of the mean vertical coordinate and vertical velocity component of about 100-200 pc and 1-2 km s(-1), respectively. As a consequence, the phase-space wrapping results in the formation of patterns with various morphologies across the disk, depending on the bar orientation, distance to the galactic center, and time elapsed since the bar buckling. Once bending waves appear, they are supported for a long time via disk self-gravity. Such vertical oscillations trigger the formation of various time-dependent phase-space spirals in the entire disk. The underlying physical mechanism implies the link between in-plane and vertical motion that leads directly to phase-space structures whose amplitude and shape are in remarkable agreement with those of the phase-space spirals observed in the Milky Way disk. In our isolated galaxy simulation, phase-space spirals are still distinguishable at the solar neighborhood 3 Gyr after the buckling phase. The long-lived character of the phase-space spirals generated by the bar buckling instability cast doubts on the timing argument used so far to get back to the time of the onset of the perturbation: phase-space spirals may have been caused by perturbations originated several gigayearrs ago, and not as recent as suggested so far.
WOS关键词VERTICAL STRUCTURE ; INSTABILITY ; DISC ; DYNAMICS ; BULGES ; MODELS
资助项目ANR (Agence Nationale de la Recherche) through the MOD4Gaia project[ANR-15-CE31-0007] ; Russian Foundation for Basic Research[16-32-60043] ; Russian Foundation for Basic Research[16-02-00649] ; Chinese Academy of Sciences through the Silk Road Project at NAOC ; Chinese Academy of Sciences through "Qianren" special foreign experts program ; Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS ; Deutsche Forschungsgemeinschaft through Collaborative Research Center "The Milky Way System" (subproject Z2) at the Ruprecht-Karls-Universitat Heidelberg[SFB 881] ; Volkswagen Foundation[90411] ; [RFMEFI62117X0011]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000457146100001
出版者EDP SCIENCES S A
资助机构ANR (Agence Nationale de la Recherche) through the MOD4Gaia project ; ANR (Agence Nationale de la Recherche) through the MOD4Gaia project ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Chinese Academy of Sciences through the Silk Road Project at NAOC ; Chinese Academy of Sciences through the Silk Road Project at NAOC ; Chinese Academy of Sciences through "Qianren" special foreign experts program ; Chinese Academy of Sciences through "Qianren" special foreign experts program ; Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS ; Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS ; Deutsche Forschungsgemeinschaft through Collaborative Research Center "The Milky Way System" (subproject Z2) at the Ruprecht-Karls-Universitat Heidelberg ; Deutsche Forschungsgemeinschaft through Collaborative Research Center "The Milky Way System" (subproject Z2) at the Ruprecht-Karls-Universitat Heidelberg ; Volkswagen Foundation ; Volkswagen Foundation ; ANR (Agence Nationale de la Recherche) through the MOD4Gaia project ; ANR (Agence Nationale de la Recherche) through the MOD4Gaia project ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Chinese Academy of Sciences through the Silk Road Project at NAOC ; Chinese Academy of Sciences through the Silk Road Project at NAOC ; Chinese Academy of Sciences through "Qianren" special foreign experts program ; Chinese Academy of Sciences through "Qianren" special foreign experts program ; Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS ; Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS ; Deutsche Forschungsgemeinschaft through Collaborative Research Center "The Milky Way System" (subproject Z2) at the Ruprecht-Karls-Universitat Heidelberg ; Deutsche Forschungsgemeinschaft through Collaborative Research Center "The Milky Way System" (subproject Z2) at the Ruprecht-Karls-Universitat Heidelberg ; Volkswagen Foundation ; Volkswagen Foundation ; ANR (Agence Nationale de la Recherche) through the MOD4Gaia project ; ANR (Agence Nationale de la Recherche) through the MOD4Gaia project ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Chinese Academy of Sciences through the Silk Road Project at NAOC ; Chinese Academy of Sciences through the Silk Road Project at NAOC ; Chinese Academy of Sciences through "Qianren" special foreign experts program ; Chinese Academy of Sciences through "Qianren" special foreign experts program ; Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS ; Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS ; Deutsche Forschungsgemeinschaft through Collaborative Research Center "The Milky Way System" (subproject Z2) at the Ruprecht-Karls-Universitat Heidelberg ; Deutsche Forschungsgemeinschaft through Collaborative Research Center "The Milky Way System" (subproject Z2) at the Ruprecht-Karls-Universitat Heidelberg ; Volkswagen Foundation ; Volkswagen Foundation ; ANR (Agence Nationale de la Recherche) through the MOD4Gaia project ; ANR (Agence Nationale de la Recherche) through the MOD4Gaia project ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Chinese Academy of Sciences through the Silk Road Project at NAOC ; Chinese Academy of Sciences through the Silk Road Project at NAOC ; Chinese Academy of Sciences through "Qianren" special foreign experts program ; Chinese Academy of Sciences through "Qianren" special foreign experts program ; Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS ; Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS ; Deutsche Forschungsgemeinschaft through Collaborative Research Center "The Milky Way System" (subproject Z2) at the Ruprecht-Karls-Universitat Heidelberg ; Deutsche Forschungsgemeinschaft through Collaborative Research Center "The Milky Way System" (subproject Z2) at the Ruprecht-Karls-Universitat Heidelberg ; Volkswagen Foundation ; Volkswagen Foundation
源URL[http://ir.bao.ac.cn/handle/114a11/24664]  
专题中国科学院国家天文台
通讯作者Khoperskov, Sergey
作者单位1.Max Planck Inst Extraterr Phys, D-85741 Garching, Germany
2.PSL Univ, Observ Paris, GEPI, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France
3.Russian Acad Sci, Inst Astron, 48 Pyatnitskya St, Moscow 119017, Russia
4.PSL Univ, Sorbonne Univ, UPMC, Observ Paris,LERMA,CNRS, F-75014 Paris, France
5.Coll France, 11 Pl Marcelin Berthelot, F-75005 Paris, France
6.Heidelberg Univ, Zentrum Astron, Astron Rech Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany
7.Chinese Acad Sci, Natl Astron Observ China, Datun Lu 20A, Beijing 100012, Peoples R China
8.Natl Acad Sci Ukraine, Main Astron Observ, Akad Zabolotnoho 27, UA-03680 Kiev, Ukraine
推荐引用方式
GB/T 7714		 Khoperskov, Sergey,Di Matteo, Paola,Gerhard, Ortwin,et al. The echo of the bar buckling: Phase-space spirals in Gaia Data Release 2[J]. ASTRONOMY & ASTROPHYSICS,2019,622:7.
APA Khoperskov, Sergey.,Di Matteo, Paola.,Gerhard, Ortwin.,Katz, David.,Haywood, Misha.,...&Gomez, Ana.(2019).The echo of the bar buckling: Phase-space spirals in Gaia Data Release 2.ASTRONOMY & ASTROPHYSICS,622,7.
MLA Khoperskov, Sergey,et al."The echo of the bar buckling: Phase-space spirals in Gaia Data Release 2".ASTRONOMY & ASTROPHYSICS 622(2019):7.

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