Timing argument take on the Milky Way and Andromeda past encounter

被引：7

作者：

Benisty, David ^{[1
,2
,3
,4
]}

机构：

[1] Frankfurt Inst Adv Studies, Ruth Moufang Str 1, D-60438 Frankfurt, Germany

[2] Ben Gurion Univ Negev, Phys Dept, IL-84105 Beer Sheva, Israel

[3] Univ Cambridge, Kavli Inst Cosmol KICC, Madingley Rd, Cambridge CB3 0HA, England

[4] Univ Cambridge, Ctr Math Sci, DAMTP, Wilberforce Rd, Cambridge CB3 0WA, England

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 656卷

关键词：

celestial mechanics; cosmology: miscellaneous; Local Group; LOCAL HUBBLE FLOW; DARK ENERGY; DISTANCE; GRAVITY; MODEL;

D O I：

10.1051/0004-6361/202142096

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The two-body problem of the M31 and Milky Way (MW) galaxies with a cosmological constant background is studied, with an emphasis on the possibility that they experienced a past encounter (PE). Past encounters are possible only for a nonzero transverse velocity, and their viability is subject to observations of the imprints of such near collisions. By implementing the timing argument (TA) for two isolated point bodies, it is shown that if M31 and the MW had experienced a PE, then the predicted mass of the Local Group (LG) would be twice larger. This predicted mass is too large and implies that the MW and M31 galaxies would have collided at similar to 8 Gys. Therefore, the TA analysis shows that a PE is not possible for the LG system.

引用

页数：4

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