The Andromeda galaxy’s stellar halo and disk show signs of an active recent merger history. Recent work suggests that most of the disturbances in Andromeda’s disk and the inner halo may be due to a single merger event.
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Gilbert, K.M. Andromeda’s violent past. Nat Astron 2, 705–706 (2018). https://doi.org/10.1038/s41550-018-0565-2
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DOI: https://doi.org/10.1038/s41550-018-0565-2