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The Effects of Dwarf Galaxies on the Orbital Evolution of Galactic Globular Clusters | | Turner Garrow
; Jeremy J. Webb
; Jo Bovy
; | | Date: |
27 Jul 2020 | | Abstract: | We investigate the effect that dwarf galaxies have on the orbits, tidal
histories, and assumed formation environment of Milky Way globular clusters. We
determine the orbits of the Milky Way’s 150 globular clusters in a
gravitational potential both with and without dwarf galaxies. We find that the
presence of a small number of satellite galaxies can strongly affect the orbits
of many of the globular clusters. Over 12 Gyr, we find that the semi-major axis
and orbital eccentricity of individual clusters fluctuate with a dispersion of
0.1 kpc and 0.05, respectively. Outer clusters are more strongly affected by
dwarf galaxies than inner clusters, with their semi-major axis and orbital
eccentricities fluctuating by more than 5 kpc and 0.1, respectively. Using
detailed N-body simulation of select clusters, we find that altering their
orbital histories can lead to different mass loss rates and structural
evolution. Furthermore, we caution against using kinematics alone to identify
whether a Galactic cluster formed in-situ or was accreted during a past merger
event as these values are no longer conserved. The presence of dwarf galaxies
causes the orbital energies and actions of individual clusters to evolve over
time, spanning a wider range than that coming from random uncertainties in a
cluster’s proper motions and radial velocity. | | Source: | arXiv, 2007.13752 | | Services: | Forum | Review | PDF | Favorites | |
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