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SUMMARY:The study of the Galactic mass distribution from Gaia DR3 RR Lyrae
DTSTART;VALUE=DATE-TIME:20230321T081500Z
DTEND;VALUE=DATE-TIME:20230321T083000Z
DTSTAMP;VALUE=DATE-TIME:20241114T092416Z
UID:indico-contribution-223@meetings.aip.de
DESCRIPTION:Speakers: Cuihua Du ()\nThe mass of the Milky Way (MW) is impo
 rtant to the formation and evolution of galaxy. After decades of study\, t
 he mass of dark matter halo is still open.  Most studies have used dynamic
 al tracers in the inner regions of the halo\, relying on extrapolations to
  estimate the mass of the MW. In our study\, we determine the Milky Way ma
 ss distribution from fitting dynamical models to the gravitational force f
 ield and the Galactic rotation curve.  Based on RR Lyrae with accurate pro
 per motions and classification in Gaia DR3\, we obtain the distance with r
 elative uncertainty less than 5% by using the extinction-free Period-Wesen
 heit relation. Applying Gaussian Mixture Model to the intrinsic velocity d
 istribution\, we present the result of a multi-component kinematic model o
 f RR Lyrae in the inner regions. Considering the early accretion history o
 f the MW so that the stellar halo may not be in equilibrium\, we separate 
 the halo population into an isotropic stellar halo and the radially-anisot
 ropic population relevant to a merge event.  With a Bayesian method\, we f
 it the potential model parameters\, including the density flattening of th
 e dark matter (DM) halo. \nIn this talk\, I shall discuss our best-fitting
  results about the shape and DM halo mass.\n\nhttps://iaus379.aip.de/event
 /20/contributions/223/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/223/
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