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The orbital poles of the Milky Way streams: testing the MW-M31 flyby scenario

Published online by Cambridge University Press:  30 October 2025

Elena Asencio Open the ORCID record for Elena Asencio [Opens in a new window]  and
Pavel Kroupa Open the ORCID record for Pavel Kroupa [Opens in a new window]
Elena Asencio*
Affiliation:
Helmholtz-Institut für Strahlen und Kernphysik (HISKP), University of Bonn, Nussallee 14-16, D-53115 Bonn, Germany
Pavel Kroupa
Affiliation:
Helmholtz-Institut für Strahlen und Kernphysik (HISKP), University of Bonn, Nussallee 14-16, D-53115 Bonn, Germany Astronomical Institute, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic
*
email: s6elena@uni-bonn.de
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Abstract

Understanding the origin of the stellar streams around the Milky Way can be of great relevance to learn about the history of the Milky Way and the formation of its substructures. A previous study on the Milky Way streams (Pawlowski et al. 2012) showed that many of these (7 out of 14) present a similar orientation to that of the disk of satellite galaxies (DoS) and the young globular clusters of the Milky Way. This suggests that the DoS, the young globular clusters and a large fraction of the Milky Way streams have a correlated origin. The authors proposed that these substructures could have formed as a result of a past interaction between the Milky Way and the Andromeda galaxy. In this work, we revise the distribution of the orbital poles of the Milky Way streams in light of the latest stream dataset, which includes a total of 97 streams.

Keywords

Galaxy: structuregalaxies: interactionsgalaxies: kinematics and dynamicsgalaxies: formationLocal Group

Information

Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 88 - 91
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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