LMC对银河系的影响

IF 3.2 Q2 ASTRONOMY & ASTROPHYSICS

Galaxies Pub Date : 2023-04-18 DOI:10.3390/galaxies11020059

E. Vasiliev

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引用次数: 4

摘要

我们回顾了最近关于大麦哲伦云（LMC）与银河系及其邻域相互作用的理论和观测进展。一个新出现的画面是，LMC是一个相当大的伴星（质量为银河系的10-20%），很可能是第一次通过其轨道的中心。LMC引起的引力扰动表现在不同的层次上。最直接的影响是经过LMC附近的恒星、恒星流或卫星星系的轨道偏转。鲜为人知但同样重要的是银河系中心区域围绕两个星系质心的位移（反射运动）。由于银河系不是刚体，这种位移随着距离LMC的距离而变化，因此，银河系变形，其外部区域（超过几十kpc）相对于其中心获得净速度。这些现象需要在当前和未来观测数据所保证的精度水平上加以考虑，建模方面的改进对于充分解释这些数据也是必要的。

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The Effect of the LMC on the Milky Way System

We review the recent theoretical and observational developments concerning the interaction of the Large Magellanic Cloud (LMC) with the Milky Way and its neighbourhood. An emerging picture is that the LMC is a fairly massive companion (10–20% of the Milky Way mass) and just passed the pericentre of its orbit, likely for the first time. The gravitational perturbation caused by the LMC is manifested at different levels. The most immediate effect is the deflection of orbits of stars, stellar streams, or satellite galaxies passing in the vicinity of the LMC. Less well known but equally important is the displacement (reflex motion) of central regions of the Milky Way about the centre of mass of both galaxies. Since the Milky Way is not a rigid body, this displacement varies with the distance from the LMC, and as a result, the Galaxy is deformed and its outer regions (beyond a few tens kpc) acquire a net velocity with respect to its centre. These phenomena need to be taken into account at the level of precision warranted by current and future observational data, and improvements on the modelling side are also necessary for an adequate interpretation of these data.

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来源期刊

Galaxies Physics and Astronomy-Astronomy and Astrophysics

CiteScore

4.90

自引率

12.00%

发文量

100

审稿时长

11 weeks

期刊介绍： Es una revista internacional de acceso abierto revisada por pares que proporciona un foro avanzado para estudios relacionados con astronomía, astrofísica y cosmología. Areas temáticas Astronomía Astrofísica Cosmología Astronomía observacional: radio, infrarrojo, óptico, rayos X, neutrino, etc. Ciencia planetaria Equipos y tecnologías de astronomía. Ingeniería Aeroespacial Análisis de datos astronómicos. Astroquímica y Astrobiología. Arqueoastronomía Historia de la astronomía y cosmología. Problemas filosóficos en cosmología.