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SUMMARY:Gaia EDR3 proper motions of Milky Way dwarfs
DTSTART;VALUE=DATE-TIME:20230320T103000Z
DTEND;VALUE=DATE-TIME:20230320T104500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115712Z
UID:indico-contribution-200@meetings.aip.de
DESCRIPTION:Speakers: Hefan Li (National Astronomical Observatories)\nBase
 d on Gaia Early Data Release 3 (EDR3)\, we estimate the proper motions for
  46 dwarf galaxies of the Milky Way. The uncertainties in proper motions\,
  determined by combining both statistical and systematic errors\, are smal
 ler by a factor 2.5\, when compared with Gaia Data Release 2. We have deri
 ved orbits in four Milky Way potential models that are consistent with the
  MW rotation curve.  Although the type of orbit (ellipse or hyperbola) are
  very dependent on the potential model\, the pericenter values are firmly 
 determined\, largely independent of the adopted MW mass model. By analyzin
 g the orbital phases\, we found that the dwarf galaxies are highly concent
 rated close to their pericenter\, rather than to their apocenter as expect
 ed from Kepler's law. This may challenge the fact that most dwarf galaxies
  are Milky Way satellites\, or alternatively indicates an unexpected large
  number of undiscovered dwarf galaxies lying very close to their apocenter
 s. Between half and two thirds of the satellites have orbital poles that i
 ndicate them to orbit along the Vast Polar Structure (VPOS)\, with the vas
 t majority of these co-orbiting in a common direction also shared by the M
 agellanic Clouds\, which  is indicative of a real structure of dwarf galax
 ies.\n\nhttps://meetings.aip.de/event/20/contributions/200/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/200/
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