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The peculiar kinematics of the multiple populations in the globular cluster Messier 80 (NGC 6093)

Kamann, S, Dalessandro, E, Bastian, N, Brinchmann, J, Brok, MD, Dreizler, S, Giesers, B, Göttgens, F, Husser, T-O, Krajnović, D, Ven, GVD, Watkins, LL and Wisotzki, L (2019) The peculiar kinematics of the multiple populations in the globular cluster Messier 80 (NGC 6093). Monthly Notices of the Royal Astronomical Society, 492 (1). pp. 966-977. ISSN 0035-8711

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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 not only vary in their light-element abundances, but also in their radial distributions, with concentration decreasing with increasing nitrogen enrichment. This remarkable trend, which sets M80 apart from the 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 2 sigma confidence level. While our data further suggest that the intermediate population shows the least amount of rotation, this trend is rather marginal (1 - 2 sigma). 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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.SR; astro-ph.SR; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 14 Jan 2020 10:01
Last Modified: 14 Jan 2020 10:15
DOI or Identification number: 10.1093/mnras/stz3506
URI: http://researchonline.ljmu.ac.uk/id/eprint/12005

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