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• W3100971847 abstract "Context. The Local Group timing has been one of the first historical pro bes of the missing mass problem. Whilst modern cosmological probes indicate that pure baryonic dynamics is not suffi cient on the largest scales, nearby galaxies and small galaxy groups persistently obey Milgrom’s MOND law, which implies that dynamics at small scales is possibly entirely predicted by the baryons. Aims. Here, we investigate the Local Group timing in this context of Milgromian dynamics. Methods. Making use of the latest measured proper motions and radial velocities for Andromeda and the Magellanic clouds, we integrate backwards their orbits by making use of the Milgromian two-body equation of motion. Results. We find that, with the currently measured proper motions and r adial velocity of M31, MOND would imply that the Milky Way and M31 first moved apart via Hubble expansion after birth , but then necessarily got attracted again by the Milgromian gravitational attraction, and had a past fly-by encounter before com ing to their present positions. This encounter would most probably have happened 7 to 11 Gyr ago (0.8 < z < 3). The absence of a dark matter halo and its associated dynamical friction is necessary for such a close encounter not to trigger a merger. Observational arguments which could exclude or favour such a past encounter would thus be very important in view of falsifying or vindicating Milgromian dynamics on the scale of the Local Group. Interestingly, the closest approach of the encounter is small enough (< 55 kpc) to have severe consequences on the disk dynamics, including perhaps thick disk formation, and on the satellite systems of both galaxies. Integrating back the orbits of the Magellanic clouds, we fi nd that, for the nominal values of their proper motions, they were close to pericenter at the time of the encounter, suggesting that th eir dynamics and/or origin might possibly be related to the event. The ages of the satellite galaxies and of the young halo globular cluster s, all of which form the vast polar structure around the Milky Way, are consistent with these objects having been born in this encounter." @default.
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• W3100971847 date "2013-09-01" @default.
• W3100971847 modified "2023-10-18" @default.
• W3100971847 title "Local Group timing in Milgromian dynamics : a past Milky Way-Andromeda encounter at z>0.8" @default.
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