2021A&A...656A.129B


Query : 2021A&A...656A.129B

2021A&A...656A.129B - Astronomy and Astrophysics, volume 656A, 129-129 (2021/12-1)

Timing argument take on the Milky Way and Andromeda past encounter.

BENISTY D.

Abstract (from CDS):

The two-body problem of the M 31 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 M 31 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 M 31 galaxies would have collided at ∼8 Gys. Therefore, the TA analysis shows that a PE is not possible for the LG system.

Abstract Copyright: © ESO 2021

Journal keyword(s): celestial mechanics - cosmology: miscellaneous - Local Group

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12097 1
2 NAME Local Group GrG ~ ~           ~ 7893 0

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2023.01.31-00:49:10

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