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Galactic Forces Rule the Dynamics of Milky Way Dwarf Galaxies

文献类型：期刊论文

作者Hammer, Francois3; Yang, Yanbin3; Arenou, Frederic3; Babusiaux, Carine2,3; Wang, Jianling1,3; Puech, Mathieu3; Flores, Hector3
刊名ASTROPHYSICAL JOURNAL
出版日期2018-06-10
卷号860期号:1页码:16
ISSN号0004-637X
关键词theory dark matter galaxies: dwarf Galaxy: structure
DOI10.3847/1538-4357/aac3da
英文摘要Dwarf galaxies populating the Galactic halo are assumed to host the largest fractions of dark matter, as calculated from their velocity dispersions. Their major axes are preferentially aligned with the Vast Polar Structure (VPOS) that is perpendicular to the Galactic disk, and we find their velocity gradients aligned as well. This finding results in a probability of random occurrence for the VPOS as low as similar to 10(-5). It suggests that tidal forces exerted by the Milky Way are distorting dwarf galaxies. Here we demonstrate on the basis of the impulse approximation that the Galactic gravitational acceleration induces the dwarf line-of-sight velocity dispersion, which is also evidenced by strong dependences between both quantities. Since this result is valid for any dwarf mass value, it implies that dark matter estimates in Milky Way dwarfs cannot be deduced from the product of their radius to the square of their line-of-sight velocity dispersion. This questions the high dark matter fractions reported for these evanescent systems, and the universally adopted total-to-stellar mass relationship in the dwarf regime. It suggests that many dwarfs are at their first passage and are dissolving into the Galactic halo. This gives rise to a promising method to estimate the Milky Way total mass profile at large distances.
WOS关键词COMMON MASS SCALE ; SPHEROIDAL GALAXY ; DARK-MATTER ; SATELLITE GALAXIES ; LOCAL GROUP ; PROPER MOTIONS ; THIN PLANE ; URSA-MAJOR ; SCULPTOR ; CARINA
资助项目China-France International Associated Laboratory Origins ; China Scholarship Council[201604910336]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000435366000001
资助机构China-France International Associated Laboratory Origins ; China-France International Associated Laboratory Origins ; China Scholarship Council ; China Scholarship Council ; China-France International Associated Laboratory Origins ; China-France International Associated Laboratory Origins ; China Scholarship Council ; China Scholarship Council ; China-France International Associated Laboratory Origins ; China-France International Associated Laboratory Origins ; China Scholarship Council ; China Scholarship Council ; China-France International Associated Laboratory Origins ; China-France International Associated Laboratory Origins ; China Scholarship Council ; China Scholarship Council
源URL[http://ir.bao.ac.cn/handle/114a11/21803]  
专题中国科学院国家天文台
通讯作者Hammer, Francois
作者单位1.Chinese Acad Sci, NAOC, A20 Datun Rd, Beijing 100012, Peoples R China
2.Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
3.Univ PSL, CNRS, Observ Paris, GEPI, Pl Jules Janssen, F-92195 Meudon, France
推荐引用方式
GB/T 7714		 Hammer, Francois,Yang, Yanbin,Arenou, Frederic,et al. Galactic Forces Rule the Dynamics of Milky Way Dwarf Galaxies[J]. ASTROPHYSICAL JOURNAL,2018,860(1):16.
APA Hammer, Francois.,Yang, Yanbin.,Arenou, Frederic.,Babusiaux, Carine.,Wang, Jianling.,...&Flores, Hector.(2018).Galactic Forces Rule the Dynamics of Milky Way Dwarf Galaxies.ASTROPHYSICAL JOURNAL,860(1),16.
MLA Hammer, Francois,et al."Galactic Forces Rule the Dynamics of Milky Way Dwarf Galaxies".ASTROPHYSICAL JOURNAL 860.1(2018):16.

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来源：国家天文台

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