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SUMMARY:Gaia EDR3 proper motions\, energies\, angular momenta of Milky Way
  dwarfs: a recent infall to the Milky Way halo
DTSTART;VALUE=DATE-TIME:20230322T110000Z
DTEND;VALUE=DATE-TIME:20230322T112500Z
DTSTAMP;VALUE=DATE-TIME:20241114T092436Z
UID:indico-contribution-174@meetings.aip.de
DESCRIPTION:Speakers: Yanbin Yang (CNRS France / Paris Observatory)\nGaia 
 EDR3 has provided proper motions of Milky Way (MW) dwarf galaxies with an 
 unprecedented accuracy\, which allows us to investigate their orbital prop
 erties. We found that the total energy and angular momentum of MW dwarfs a
 re much larger than that of MW K-giant stars\, Sagittarius stream stars an
 d globular clusters. It suggests that many MW dwarfs have recently infall 
 into the Milky Way halo. We also confirmed that Milky Way dwarfs lie prefe
 rentially near their pericenters and many of them belong to a vast polar s
 tructure perpendicular to the Milky Way disk\, which suggests that Milky W
 ay dwarfs do not behave like satellite systems derived from LCDM cosmologi
 cal simulations. These new results require revisiting the origin of MW dwa
 rf galaxies\, e.g.\, if they came recently\, they were likely to have expe
 rienced gas removal due to the ram pressure induced by MW’s hot gas\, an
 d to be affected by MW tides. We will discuss the consequences of these pr
 ocesses on their mass estimation.\n\nhttps://iaus379.aip.de/event/20/contr
 ibutions/174/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/174/
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