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SUMMARY:Observing and interpreting bar-halo resonances - Vasily Belokurov 
 (IoA Cambridge)
DTSTART:20250724T113000Z
DTEND:20250724T123000Z
UID:TALK234988@talks.cam.ac.uk
CONTACT:Mika Kontiainen
DESCRIPTION:    The Galactic bar is one of the main drivers of dynamical e
 volution in the Milky Way. It redistributes angular momentum\, reshapes st
 ellar orbits\, and facilitates radial migration—bringing stars\, includi
 ng many exoplanet hosts\, from the inner Galaxy into the Solar neighborhoo
 d. Understanding the bar's properties and its interaction with the dark ma
 tter halo is therefore essential for reconstructing the formation history 
 of the Milky Way and interpreting the stellar populations we observe local
 ly.\n\n    In recent work with Adam Dillamore\, we show that distinct chev
 ron-shaped features in the phase-space distribution of halo stars can be e
 xplained by resonant interactions with the bar. These features\, seen in G
 aia data\, allow us to infer the bar's pattern speed and gravitational inf
 luence. Because the structure and location of these resonances evolve over
  time\, they also provide clues to the bar's past growth and its coupling 
 to the dark matter halo. This work opens a new window into bar–halo dyna
 mics and highlights how seemingly distant halo stars can help constrain th
 e internal evolution of the Milky Way.
LOCATION:Institute of Astronomy 
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