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SUMMARY:The Formation of Planes of Satellite Galaxies in the Local Group
DTSTART;VALUE=DATE-TIME:20230322T114800Z
DTEND;VALUE=DATE-TIME:20230322T115000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115743Z
UID:indico-contribution-263@meetings.aip.de
DESCRIPTION:Speakers: Janvi Madhani ()\nNumerous observations in recent ye
 ars have shown that the satellite galaxies orbiting our local galaxies ten
 d to align their orbits in one or two thin planes around the host galaxy. 
 This has been observed in local galaxies\, Andromeda and Centaurus A\, and
  our own Milky Way. Numerical simulations in a cosmological context find t
 hese planes to be rare or short-lived leading to tension between observati
 on and theory. This leads to considerable debate on whether observations a
 re compatible with the standard\, Lambda Cold Dark Matter\, model of cosmo
 logy. We argue that on large scales\, these simulations did not sufficient
 ly resolve the nearby large-scale structure\, cosmic filaments\, which we 
 believe to be responsible for the anisotropic infall of satellites forming
  planar alignments\, and on smaller scales\, they did not sufficiently res
 olve dwarf satellite galaxies. We use the high precision\, hydrodynamic\, 
 cosmological zoom simulation\, New Horizon\, which has both the large volu
 me\, (16 Mpc)$^3$ and the small-scale resolution\, ~ 35 pc\, required to s
 tudy the interplay between cosmic web dynamics and the formation\, funneli
 ng\, and eventually the anisotropic distribution of satellites around loca
 l galaxies. Our results indicate that these planes exist in New Horizon in
  ~ 30% of Milky Way-type systems. The identified planes are comparable to 
 observation in both physical extent and kinematic coherence. We also find 
 that the distribution of dwarf satellites within their host dark matter ha
 loes is more anisotropic than previously understood.\n\nhttps://meetings.a
 ip.de/event/20/contributions/263/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/263/
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