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SUMMARY:Exploring the dynamical decoupling of the components of the Androm
 eda galaxy
DTSTART;VALUE=DATE-TIME:20230321T120500Z
DTEND;VALUE=DATE-TIME:20230321T120700Z
DTSTAMP;VALUE=DATE-TIME:20241114T092422Z
UID:indico-contribution-243@meetings.aip.de
DESCRIPTION:Speakers: Jean-Baptiste Salomon (Hebrew University)\nThe study
  of the dynamical mass of the Local Group requires a detailed knowledge of
  the velocity of its elements\, in particular of the Milky Way (MW) and th
 e Andromeda galaxy (M31). Nevertheless\, a discrepancy between the proper 
 motion of the disk of M31 and the global motion of its satellites has been
  identified. Moreover\, recent results showing the influence of the Magell
 anic complex on the displacement of the MW disk suggest a possible decoupl
 ing between the different components of spiral galaxies\, notably the dark
  and baryonic parts. To explore this possibility\, we study the position a
 nd kinematic deviations that may arise between the disk of a MW (or M31)-l
 ike galaxy and its halo\, from constrained high resolution cosmological si
 mulations of the Local Group in realistic environment\, namely HESTIA simu
 lations. We focus on the 3-dimensional analysis of the centers of mass (CO
 M). We present two parts. We first consider individual particles to track 
 down the very nature and amplitude of the physical deviations of the COM w
 ith respect to the distance from the disk center. Dark matter is dominatin
 g the behavior of the COM of all particles at all distances. But the total
  COM is also very close to the COM of stars. In the absence of a significa
 nt merger\, the velocity offsets are marginal (10 km/s) but the positional
  shifts can be important compared to the disk characteristics (> 10 kpc). 
 In the event of a major merger\, discrepancies are found to be of the same
  order as the recent finding for the MW under the Magellanic Clouds influe
 nce. In a second part\, we put the accent on the study of various populati
 ons of subhaloes and satellites. We show that while satellites properly re
 present the entire subhalo population\, there exists strong mismatch in ph
 ase space between their COM and the host disk. Moreover\, the results are 
 highly inhomogeneous between the simulations\, and thus between the accret
 ion histories. It is highlighted that these shifts are mainly due to the t
 hree or four most massive objects. We will finally compare these results i
 n the light of our observational knowledge.\n\nhttps://iaus379.aip.de/even
 t/20/contributions/243/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/243/
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