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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20201103T103000
DTEND;TZID=Atlantic/Canary:20201103T113000
UID:iactalks-1416
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1416
CREATED:2020-11-03T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Our Galaxy in its infancy as traced by Gaia and complementary spect
 roscopic surveys
DESCRIPTION:Our Galaxy in its infancy as traced by Gaia and complementary s
 pectroscopic surveys\nDrs. Paola Di Matteo\n\nReconstructing the past of t
 he Milky Way depends on the study of its metal-poor stars, which either ha
 ve been formed in the Galaxy itself in the first billion years, or have be
 en accreted through mergers of satellite galaxies over time. These stars a
 re usually found in what is known as the Milky Way halo, a light — i
 n terms of total mass —  stellar component which is usually mad
 e of stars whose kinematics significantly deviates from that of the Galact
 ic disc.In this talk, I will discuss how it has been possible to use the a
 strometric and spectroscopic data delivered by Gaia and complementary surv
 eys  to shed light on the past of our Galaxy, through the study of it
 s halo. Besides the discovery of the possible last significant merger expe
 rienced by the Milky Way, the use of 6D phase space information and chemic
 al abundances allowed to reconstruct the impact this merger had on the ear
 ly Milky Way disc, and the time it occurred, as well as to discover that s
 ome of the most metal-poor stars in the Galaxy possibly formed in a disc.&
 nbsp; This last finding would imply that the dissipative collapse that led
  to the formation of the old Galactic disc must have been extremely fast.\
 n \n
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