The peculiar kinematics of the multiple populations in the globular cluster Messier 80 (NGC 6093)
- Author(s)
- S. Kamann, E. Dalessandro, N. Bastian, J. Brinchmann, M. den Brok, S. Dreizler, B. Giesers, F. Göttgens, T.-O. Husser, D. Krajović, G. van de Ven, L. L. Watkins, L. Wisotzki
- Abstract
We combine MUSE spectroscopy and Hubble Space Telescope ultraviolet (UV) photometry to perform a study of the chemistry and dynamics of the Galactic globular cluster Messier 80 (M80, NGC 6093). Previous studies have revealed three stellar populations that vary not only in their light-element abundances, but also in their radial distributions, with the concentration decreasing with increasing nitrogen enrichment. This remarkable trend, which sets M80 apart from other Galactic globular clusters, points towards a complex formation and evolutionary history. To better understand how M80 formed and evolved, revealing its internal kinematics is key. We find that the most N-enriched population rotates faster than the other two populations at a 2σ confidence level. While our data further suggest that the intermediate population shows the least amount of rotation, this trend is rather marginal (1-2σ). Using axisymmetric Jeans models, we show that these findings can be explained from the radial distributions of the populations if they possess different angular momenta. Our findings suggest that the populations formed with primordial kinematical differences.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Liverpool John Moores University (LJMU), INAF-Osservatorio Astronomico di Bologna, Universidade do Porto, Leiden University, Leibniz-Institut für Astrophysik Potsdam, Georg-August-Universität Göttingen, European Southern Observatory (Germany)
- Journal
- Monthly Notices of the Royal Astronomical Society
- Volume
- 492
- Pages
- 966–977
- No. of pages
- 12
- ISSN
- 0035-8711
- DOI
- https://doi.org/10.1093/mnras/stz3506
- Publication date
- 12-2019
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/8c3aac58-9b5a-42e6-b320-04f6274287d5