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Photo of Paul McMillan

Paul McMillan

Researcher

Photo of Paul McMillan

Spiral arm crossings inferred from ridges in Gaia stellar velocity distributions

Author

  • Alice C. Quillen
  • Ismael Carrillo
  • Friedrich Anders
  • Paul McMillan
  • Tariq Hilmi
  • Giacomo Monari
  • Ivan Minchev
  • Cristina Chiappini
  • Arman Khalatyan
  • Matthias Steinmetz

Summary, in English

The solar neighbourhood contains disc stars that have recently crossed spiral arms in the Galaxy. We propose that boundaries in local velocity distributions separate stars that have recently crossed and been more strongly perturbed by a particular arm from those that haven't. Ridges in the stellar velocity distributions constructed from the second Gaia data release trace orbits that could have touched nearby spiral arms at apocentre or pericentre. The multiple ridges and arcs seen in local velocity distributions are consistent with the presence of multiple spiral features and different pattern speeds and imply that the outer Galaxy is flocculent rather than grand design.

Department/s

  • Lund Observatory

Publishing year

2018

Language

English

Pages

3132-3139

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

480

Issue

3

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Galaxy: kinematics and dynamics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711