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Dalessandro, E, Raso, S, Kamann, S, Bellazzini, M, Vesperini, E, Bellini, A and Beccari, G (2021) 3D core kinematics of NGC 6362: central rotation in a dynamically evolved globular cluster. Monthly Notices of the Royal Astronomical Society, 506 (1). pp. 813-823. ISSN 0035-8711
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3d Core kinematics of NGC 6362 central rotation in a dynmically evolved globular cluster.pdf - Published Version Download (2MB) | Preview |
Abstract
We present a detailed 3D kinematic analysis of the central regions (R < 30 arcsec) of the low mass and dynamically evolved galactic globular cluster (GC) NGC 6362. The study is based on data obtained with ESO-VLT/MUSE used in combination with the adaptive optics module and providing ∼3000 line-of-sight radial velocities, which have been complemented with Hubble Space Telescope proper motions. The quality of the data and the number of available radial velocities allowed us to detect for the first time a significant rotation signal along the line of sight in the cluster core with amplitude of ∼1 km s−1 and with a peak located at only ∼20 arcsec from the cluster centre, corresponding to only ∼10 per cent of the cluster half-light radius. This result is further supported by the detection of a central and significant tangential anisotropy in the cluster innermost regions. This is one of the most central rotation signals ever observed in a GC to date. We also explore the rotational properties of the multiple populations hosted by this cluster and find that Na-rich stars rotate about two times more rapidly than the Na-poor sub-population thus suggesting that the interpretation of the present-day GC properties require a multicomponent chemo-dynamical approach. Both the rotation amplitude and peak position would fit qualitatively the theoretical expectations for a system that lost a significant fraction of its original mass because of the long-term dynamical evolution and interaction with the Galaxy. However, to match the observations more quantitatively further theoretical studies to explore the initial dynamical properties of the cluster are needed.
| Item Type: | Article |
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| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Uncontrolled Keywords: | ABUNDANCE ANOMALIES; ACS SURVEY; astrometry; Astronomy & Astrophysics; EVOLUTION; GAIA; globular clusters: individual: NGC6362; Hertzsprung-Russell and colour-magnitude diagrams; MULTIPLE STELLAR POPULATIONS; N-BODY; Physical Sciences; Science & Technology; STAR-CLUSTERS; stars: kinematics and dynamics; SUPERMASSIVE STARS; techniques: photometric; techniques: spectroscopic; UV LEGACY SURVEY; VELOCITY DISPERSION PROFILES; Science & Technology; Physical Sciences; Astronomy & Astrophysics; techniques: photometric; techniques: spectroscopic; astrometry; Hertzsprung-Russell and colour-magnitude diagrams; stars: kinematics and dynamics; globular clusters: individual: NGC6362; MULTIPLE STELLAR POPULATIONS; UV LEGACY SURVEY; VELOCITY DISPERSION PROFILES; STAR-CLUSTERS; ABUNDANCE ANOMALIES; SUPERMASSIVE STARS; ACS SURVEY; N-BODY; EVOLUTION; GAIA; Science & Technology; Physical Sciences; Astronomy & Astrophysics; techniques: photometric; techniques: spectroscopic; astrometry; Hertzsprung-Russell and colour-magnitude diagrams; stars: kinematics and dynamics; globular clusters: individual: NGC6362; MULTIPLE STELLAR POPULATIONS; UV LEGACY SURVEY; VELOCITY DISPERSION PROFILES; STAR-CLUSTERS; ABUNDANCE ANOMALIES; SUPERMASSIVE STARS; DATA REDUCTION; PROPER MOTION; ACS SURVEY; N-BODY; astro-ph.GA; astro-ph.GA; astro-ph.SR; Astronomy & Astrophysics; 0201 Astronomical and Space Sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 07 Oct 2022 11:53 |
| Last Modified: | 07 Oct 2022 12:00 |
| DOI or ID number: | 10.1093/mnras/stab1257 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/17757 |
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