The Sagittarius impact as an architect of spirality and outer rings in the Milky Way

Chris W. Purcell (), James S. Bullock, Erik J. Tollerud, Miguel Rocha and Sukanya Chakrabarti
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Chris W. Purcell: The University of Pittsburgh
James S. Bullock: Center for Cosmology, The University of California
Erik J. Tollerud: Center for Cosmology, The University of California
Miguel Rocha: Center for Cosmology, The University of California
Sukanya Chakrabarti: Florida Atlantic University

Nature, 2011, vol. 477, issue 7364, 301-303

Abstract: Reshaping the Galaxy Since its discovery more than a decade ago, the Sagittarius dwarf galaxy (Sgr), a satellite galaxy of our own Milky Way, has been recognized as a local analogue to the numerous mergers thought to be common in galaxies throughout the Universe. Traditionally, Sgr has been treated as a negligible perturber to the Galactic disk. New simulations of the response of the Milky Way to the infall of the Sgr reveal that, on the contrary, Sgr has played an important part in shaping the disk morphology. Past impacts have triggered the formation of spiral structure and influenced bar evolution.

Date: 2011
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DOI: 10.1038/nature10417

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