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SUMMARY:Small-scale stellar haloes: detecting extended substructure in the
  outskirts of Milky Way dwarf galaxy satellites
DTSTART;VALUE=DATE-TIME:20230322T104500Z
DTEND;VALUE=DATE-TIME:20230322T110000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115740Z
UID:indico-contribution-198@meetings.aip.de
DESCRIPTION:Speakers: Jaclyn Jensen (University of Victoria)\nDwarf galaxi
 es are valuable laboratories for dynamical studies related to dark matter 
 and galaxy evolution\, yet it is currently unknown just how extended their
  stellar components are. Each satellite orbiting within the Milky Way’s 
 (MW’s) gravitational potential may undergo tidal stripping by the host g
 alaxy\, or alternatively\, may themselves have accreted yet smaller system
 s whose debris settles into the satellite’s own stellar halo. Both proce
 sses could mean that significant populations of member stars are found far
  from the center of the dwarf. Stars in the outskirts of these systems are
  especially valuable – and rare – tracers of the dwarf’s dynamics in
  low acceleration regimes\, and they give insight into the dwarf’s evolu
 tionary history. In this work\, we examine the MW’s ~60 dwarf satellites
  to search for these rare\, distant member stars. Using Gaia eDR3 and a ma
 ximum likelihood approach allowing for multi-component extended substructu
 res\, we find 9 dwarfs that exhibit a secondary\, lower-density\, outer pr
 ofile\, that we argue is indicative of an extended stellar halo and/or tid
 al disruption. Our method shows excellent consistency with spectroscopical
 ly confirmed members from the literature and requires no radial velocity i
 nformation. For each dwarf galaxy\, we derive a sample of high-confidence 
 members which will prove useful for studying even the faintest MW dwarfs. 
 We also briefly discuss a current spectroscopic follow-up campaign for the
  most radially distant outskirt members\, which will feature the newly com
 missioned Gemini High-resolution Optical SpecTrograph (GHOST). Already\, i
 nitial spectra obtained during GHOST commissioning has proven useful for c
 omprehensive chemodynamics of these Galactic building blocks.\n\nhttps://m
 eetings.aip.de/event/20/contributions/198/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/198/
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