The Influence of the Galactic Bar on the Dynamics of Globular Clusters
arXiv:2303.05603 · doi:10.3390/galaxies11010026
Abstract
We make use of recent estimates for the parameters of the Milky Way's halo globular clusters and study the influence of the galactic bar on the dynamics of these clusters by computing their orbits. We use both an axisymmetric and non-axisymmetric galactic potentials, which include the rotating elongated bar/bulge structure. We account for observational errors both in the positions and in the velocities of the globular clusters and explore the influence of the bar on cluster's evolution. This is contained in the angular momentum-total energy plane, (Lz,E), which is widely exploited as an indicator of the groups of globular clusters that originated from the same accretion event. Particular attention is devoted to the Gaia-Sausage/Enceladus and Pontus structures identified recently as two independent accretion events. Our study shows that it is not possible to identify GSE and Pontus as different merger events.
17 pages, 9 figures
References in corpus (18)
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- Cold streams in early massive hot haloes as the main mode of galaxy formation
- galpy: A Python Library for Galactic Dynamics
- The mass distribution and gravitational potential of the Milky Way
- Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
- Are the Magellanic Clouds on their First Passage about the Milky Way?
- Dynamics of Barred Galaxies
- Evidence for Two Early Accretion Events That Built the Milky Way Stellar Halo
- Dynamical modelling of the Galactic bulge and bar: the Milky Way's bar pattern speed, stellar, and dark matter mass distribution
- Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
- Made-to-Measure models of the Galactic Box/Peanut bulge: stellar and total mass in the bulge region
- The Global Dynamical Atlas of the Milky Way mergers: Constraints from Gaia EDR3 based orbits of globular clusters, stellar streams and satellite galaxies
- Gaia Data Release 1, Pre-processing and source list creation
- On feathers, bifurcations and shells: the dynamics of tidal streams across the mass scale
- Formation histories of stars, clusters and globular clusters in the E-MOSAICS simulations
- The Bar and Spiral Arms in the Milky Way: Structure and Kinematics
- Transverse kinematics of the Galactic bar-bulge from VVV and Gaia
- Quantifying torque from the Milky Way bar using Gaia DR2