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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20211125T103000
DTEND;TZID=Atlantic/Canary:20211125T113000
UID:iactalks-1500
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1500
CREATED:2021-11-25T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:What happened to the Milky Way 8 billion years ago?
DESCRIPTION:What happened to the Milky Way 8 billion years ago?\nDr. Floren
 t Renaud\n\nThe formation and evolution of galaxies  across cosmic ti
 me proceeds in different phases, paced by their internal  evolution a
 nd external factors like gas accretion and mergers. The  complex&nbsp
 ;and always changing interplay between these mechanisms drives  the a
 ssembly of galaxies and the physical conditions for star formation,  
 which leaves observable imprints on the stellar populations.  Large&n
 bsp;astrometric and spectroscopic surveys (e.g. Gaia, APOGEE, GALAH)  coll
 ect the signatures of these past events in the building history of  t
 he Milky Way. However, simulations and models are necessary to d
 ecode  the data. In this talk, I will present results from a series o
 f  hydrodynamical simulations of Milky Way-like galaxies, both in iso
 lation  and in cosmological context using the VINTERGATAN simula
 tion. I will  show the crucial role of mergers, and of the end of the
  merger phase, in  forming the thick and thin Galactic discs, and mak
 ing the transition  between the two. I will then nuance this conclusi
 on by explaining why  the secular consumption of gas enables a simila
 r transition, as well as  the emergence of spirals, without any 
 external factors.
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