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SUMMARY:Precise constrained cosmological simulations of the Local Group
DTSTART;VALUE=DATE-TIME:20230324T111500Z
DTEND;VALUE=DATE-TIME:20230324T113000Z
DTSTAMP;VALUE=DATE-TIME:20241114T092457Z
UID:indico-contribution-221@meetings.aip.de
DESCRIPTION:Speakers: Ewoud Wempe (Kapteyn Astronomical Institute)\nCosmol
 ogical simulations have been used to understand the formation of structure
  in the LCDM paradigm on small and large scales. Most simulations start wi
 th unconstrained Gaussian initial conditions\, and therefore generically d
 o not produce good analogues of the Local Group at present day. While cons
 trained simulations exist\, these have difficulty in precisely satisfying 
 all our observational constraints on the Local Group\, and their result is
  not an unbiased and fair sample of the posterior distribution of LCDM uni
 verses subject to the observational constraints of the Local Group. Some a
 pplications of such a sample include putting into cosmological context our
  distribution of satellites\, the alignment of the dark-matter haloes and 
 their spin and the relation to the assembly history\, and to determine the
  effect of our environment on the Local Group's spatial configuration and 
 kinematics.\n\nIn this work\, we extend the BORG algorithm (Bayesian Origi
 n Reconstruction from Galaxies)\, that has already been used to model the 
 Local Large-Scale Structure\, to reconstruct the Local Group. Using this t
 oolset\, we perform a statistical inference on the history of the Local Gr
 oup\, following a LCDM prior on the cosmological initial conditions\, and 
 a likelihood that constrains local observational quantities\, like the mas
 ses\, positions\, and velocities of the Milky Way and Andromeda haloes. In
  the near future\, we plan to embed our Local Group in a realistic large-s
 cale structure as well. To the best of our knowledge\, this is the first t
 ime a cosmological simulation has been able to reproduce all these propert
 ies simultaneously with high precision.\n\nhttps://iaus379.aip.de/event/20
 /contributions/221/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/221/
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