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Accreted Globular Clusters in external galaxies: Why adaptive dynamics is not the solution

Published online by Cambridge University Press:  14 May 2020

Sophia Lilleengen Open the ORCID record for Sophia Lilleengen [Opens in a new window] ,
Wilma Trick  and
Glenn van de Ven Open the ORCID record for Glenn van de Ven [Opens in a new window]
Sophia Lilleengen
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching b. München, Germany email: sophialilleengen@gmail.com Department of Physics and Astronomy, University of Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany
Wilma Trick
Affiliation:
Max-Planck-Insitut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching b. München, Germany
Glenn van de Ven
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching b. München, Germany email: sophialilleengen@gmail.com Department of Astrophysics, University of Vienna, Türkenschanzenstrasse 17, 1180 Wien, Austria
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Abstract

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Many astrophysical and galaxy-scale cosmological problems require a well determined gravitational potential which is often modeled by observers under strong assumptions. Globular clusters (GCs) surrounding galaxies can be used as dynamical tracers of the luminous and dark matter distribution at large (kpc) scales. A natural assumption for modeling the gravitational potential is that GCs accreted in the same dwarf galaxy merger event move at the present time on similar orbits in the host galaxy and should therefore have similar actions. We investigate this idea in one realistic Milky Way like galaxy of the cosmological N-body simulation suite Auriga. We show how the actions of accreted stellar particles in the simulation evolve and that minimizing the standard deviation of GCs in action space, however, cannot constrain the true potential. This approach known as ‘adaptive dynamics’ does therefore not work for accreted GCs.

Keywords

galaxies: kinematics and dynamicsgalaxies: evolutiongalaxies: star clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 266 - 270
Copyright
© International Astronomical Union 2020

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