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SUMMARY:The different merger and evolutionary histories of the Milky Way a
 nd Andromeda (M31) - Ortwin Gerhard\, MPE (Garching)
DTSTART:20250515T150000Z
DTEND:20250515T160000Z
UID:TALK231538@talks.cam.ac.uk
CONTACT:88984
DESCRIPTION:The Milky Way experienced a major satellite merger ~10 Gyr ago
  which altered\, but did not destroy\, the early high-alpha disk and creat
 ed both an accreted and an in situ inner halo. The low-alpha disk that for
 med subsequently became bar-unstable ~8 Gyr ago\, creating the b/p bulge t
 hat also contains the inner high-alpha disk stars. M31 experienced a simil
 ar major satellite merger ~3 Gyr ago which greatly heated and mixed the pr
 e-existing high-metallicity disk\, and also caused a massive inflow of gas
  and the formation of a dynamically hot secondary inner disk. Such a merge
 r is consistent with the wide-spread star formation event ~2-4 Gyr ago see
 n in disk colour-magnitude diagrams\, and with the major substructures and
  metal-rich stars in the inner halo of M31\, when comparing photometric an
 d recent spectroscopic data with available models. The merged satellite mu
 st have had a broad metallicity distribution and would have been the third
  most massive galaxy in the Local Group before the merger.
LOCATION:Hoyle Lecture Theatre\, Institute of Astronomy
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