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SUMMARY:3D Velocities of Local Group dwarf galaxies combining HST and Gaia
DTSTART;VALUE=DATE-TIME:20230322T092500Z
DTEND;VALUE=DATE-TIME:20230322T092700Z
DTSTAMP;VALUE=DATE-TIME:20241114T092430Z
UID:indico-contribution-224@meetings.aip.de
DESCRIPTION:Speakers: Paul Bennet (Space Telescope Science Institute)\nGai
 a has revolutionized our understanding of the Milky Way (MW) and its satel
 lite system. However\, the proper motions (PMs) of dwarf galaxies outside 
 the MW system remain out of reach by Gaia and will remain so even with fut
 ure data releases. This is problematic\, as it means that our understandin
 g of systems outside the MW will be limited and we may be basing much of o
 ur cosmological modeling on the MW alone\, which may be atypical. This lim
 itation can be overcome through the use data from the Hubble Space Telesco
 pe\, either obtained at two different epochs\, or at one past epoch and co
 mbined with more recent Gaia positions. I will present new PMs obtained in
  this manner for a sample of distant dwarf galaxies in the Local Group (LG
 )\, expanding the number of systems for which we have full position-veloci
 ty information.  These can be used to calculate the implied orbits. I will
  discuss how this information allows new science with the LG dwarfs and th
 eir hosts\, linking the star formation and orbital histories of dwarfs to 
 determine when specific dwarfs   quenched and whether they are first-infal
 l or ‘backsplash’ galaxies and how we can use this to determine host p
 roperties such as halo mass and the extent of the hot gas halo.\n\nhttps:/
 /iaus379.aip.de/event/20/contributions/224/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/224/
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