Two kinematically distinct old globular cluster populations in the Large Magellanic Cloud
We report results of proper motions of 15 known Large Magellanic Cloud (LMC) old globular clusters (GCs) derived from the Gala DR2 data sets. When these mean proper motions are gathered with existent radial velocity measurements to compose the GCs' velocity vectors, we found that the projection...
| Authors: | , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2019 |
| Country: | España |
| Institution: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repository: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/204809 |
| Online Access: | http://hdl.handle.net/10261/204809 |
| Access Level: | Open access |
| Keyword: | Galaxies: individual: LMC Galaxies: star clusters: general |
| Summary: | We report results of proper motions of 15 known Large Magellanic Cloud (LMC) old globular clusters (GCs) derived from the Gala DR2 data sets. When these mean proper motions are gathered with existent radial velocity measurements to compose the GCs' velocity vectors, we found that the projection of the velocity vectors on to the LMC plane and those perpendicular to it tells us about two distinct kinematic GC populations, Such a distinction becomes clear if the GCs are split at a perpendicular velocity of 10 km s(-1) (absolute value), The two differ eta kinematic groups also exhibit different spatial distributions, Those with smaller vertical velocities are a part of the LMC disc, while those with larger values are closely distributed like a spherical component. Since GCs in both kinematic-structural components share similar ages and metallicities, we speculate with the possibility that their origins could have occurred through a fast collapse that formed halo and disc concurrently.© 2019 The Author(s).Published by Oxford University Press on behalf of the Royal Astronomical Society |
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