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University of Cambridge > Talks.cam > Institute of Astronomy Colloquia > The different merger and evolutionary histories of the Milky Way and Andromeda (M31)
![]() The different merger and evolutionary histories of the Milky Way and Andromeda (M31)Add to your list(s) Download to your calendar using vCal
If you have a question about this talk, please contact . The Milky Way experienced a major satellite merger 10 Gyr ago which altered, but did not destroy, the early high-alpha disk and created both an accreted and an in situ inner halo. The low-alpha disk that formed subsequently became bar-unstable 8 Gyr ago, creating the b/p bulge that also contains the inner high-alpha disk stars. M31 experienced a similar major satellite merger 3 Gyr ago which greatly heated and mixed the pre-existing high-metallicity disk, and also caused a massive inflow of gas and the formation of a dynamically hot secondary inner disk. Such a merger is consistent with the wide-spread star formation event 2-4 Gyr ago seen in disk colour-magnitude diagrams, and with the major substructures and metal-rich stars in the inner halo of M31 , when comparing photometric and recent spectroscopic data with available models. The merged satellite must have had a broad metallicity distribution and would have been the third most massive galaxy in the Local Group before the merger. This talk is part of the Institute of Astronomy Colloquia series. This talk is included in these lists:
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