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SUMMARY:Constraining dark matter density profiles with dwarf galaxy kinema
 tics: the 2D and the 6D story
DTSTART:20260408T010000Z
DTEND:20260408T020000Z
DTSTAMP:20260509T175200Z
UID:indico-event-2815@indico.phys.hawaii.edu
DESCRIPTION:Speakers: Isabelle Goldstein (Texas A&M University)\n\nThe ste
 llar kinematics in dwarf galaxies can provide a wealth of information abou
 t its underlying dark matter distribution. Line-of-sight velocity dispersi
 on measurements from six classical dwarf galaxies can be used to show that
  axion-like particles with masses of order m ~ 10^(−22) eV are inconsist
 ent with the potential distribution in classical dwarf galaxies unless the
  hierarchical assembly of the Milky Way did not trace the mean evolution o
 f Milky Way size halos. However\, line-of-sight velocity constraints alone
  are subject to degeneracies between central dark matter density and stell
 ar velocity anisotropy. Using both line-of-sight velocities and proper mot
 ions from Gaia DR3 data\, we examine the kinematics of the central core of
  the Sagittarius (Sgr) dwarf spheroidal galaxy. We extract a sample of bri
 ght stars that are high-probability members of Sgr and obtain a velocity a
 nisotropy of βa=−2.24±1.99\, which implies a system with tangentially-
 biased orbits. However without accurate distances to these stars\, a 6D Je
 ans analysis cannot be performed. From Gaia only 5D data plus mock distanc
 es\, we project that the data will significantly improve upon measurements
  of the log-slope of the dark matter density profile and the stellar veloc
 ity anisotropy. Tests with mock distance data show an improvement of aniso
 tropy errors of approximately an order of magnitude\, and log slope at the
  half light radius of approximately half an order of magnitude\, indicatin
 g stronger future constraints on dark matter density profiles. \n\nhttps:
 //indico.phys.hawaii.edu/event/2815/
LOCATION:Room 112 (Watanabe Hall)
URL:https://indico.phys.hawaii.edu/event/2815/
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