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SUMMARY:Forming the Local Group satellite planes in a past Milky Way-Andro
 meda flyby
DTSTART;VALUE=DATE-TIME:20230324T113000Z
DTEND;VALUE=DATE-TIME:20230324T114500Z
DTSTAMP;VALUE=DATE-TIME:20241114T092458Z
UID:indico-contribution-218@meetings.aip.de
DESCRIPTION:Speakers: Indranil Banik (University of Saint Andrews)\nThe sa
 tellite galaxy systems of the Milky Way (MW) and M31 both show a very thin
  kinematically coherent structure or satellite plane. It has previously be
 en shown that each plane is in 3.55σ tension with ΛCDM expectations\, wh
 ich combined with the similar structure around Centaurus A falsifies the m
 odel at 5.3σ confidence. In this talk\, I will present hydrodynamical sim
 ulations of the MW and M31 in Milgromian dynamics (MOND)\, which requires 
 them to have experienced a past close flyby roughly 9 Gyr ago. While the f
 ormation of tidal dwarf galaxies is not resolved\, the tidal debris around
  each galaxy ends up distributed anisotropically. In each case\, the prefe
 rred orientation matches that of the actually observed satellite galaxy pl
 ane (MNRAS\, 513\, 129). The MW and M31 retain thin discs with realistic s
 cale lengths\, orientations\, and present separation. I will therefore arg
 ue that the Local Group satellite planes are best understood as arising fr
 om a past close MW-M31 flyby in MOND\, whose enhancement to gravity at low
  accelerations naturally explains the apparent dark matter content of the 
 satellite plane members. This contrasts with the Newtonian picture where t
 idal dwarfs should lack dark matter\, while primordial dwarfs should be di
 stributed almost isotropically and should moreover constitute the dominant
  satellite population.\n\nhttps://iaus379.aip.de/event/20/contributions/21
 8/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/218/
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