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SUMMARY:Special Seminar | Hanyuan Zhang (Cambridge)
DTSTART:20260622T090000Z
DTEND:20260622T100000Z
DTSTAMP:20260622T094504Z
UID:www.aip.de-2524
CATEGORIES:Scientific
CATEGORIES:Scientific Talk
CATEGORIES:Public
CATEGORIES:Special Seminar
CATEGORIES:Galaxies\, Cosmology
CONTACT:Ivan Minchev <iminchev@aip.de>
DESCRIPTION:Speaker: Hanyuan Zhang (Cambridge)\nTitle: Modelling the secul
 ar evolution of the Milky Way’s disc\nAbstract: Stellar orbits in galact
 ic discs are not static but evolve through gravitational interactions with
  non-axisymmetric perturbations\, such as bars\, spirals\, and giant molec
 ular clouds. This process\, known as secular evolution\, efficiently redis
 tributes stars across the disc\, thereby mixing chemical signatures from t
 heir birthplaces and altering the galaxy's chemodynamical properties. Obse
 rvationally\, the age-metallicity distribution of the Galactic disc offers
  valuable insights into the Milky Way's secular evolution history. In this
  talk\, I will present our recent findings on mapping the Milky Way's secu
 lar evolution using main-sequence turn-off stars from LAMOST. I will demon
 strate how bar-driven radial migration can reproduce observed bimodal age-
 metallicity sequences. Additionally\, I will introduce our new chemo-chron
 o-dynamical model of the Galactic disc\, which reconstructs its inside-out
  growth\, metallicity evolution\, and secular evolution history. Our work 
 reveals a clear transition in radial migration strength\, occurring around
  the epoch of the high- to low-α disc transition. Finally\, by comparing 
 these findings with Nexus simulations\, I will discuss the implications of
  the inferred secular evolution history for the Milky Way.\n
LOCATION:AIP\; Kirch building\, Conference room
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