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Dark matter distribution and dynamics of dwarf spheroidal galaxies

Published online by Cambridge University Press:  14 May 2020

Ewa L. Łokas Open the ORCID record for Ewa L. Łokas [Opens in a new window]
Ewa L. Łokas*
Affiliation:
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland email: lokas@camk.edu.pl
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Abstract

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I review the current status of dynamical modelling of dwarf spheroidal galaxies focusing on estimates of their dark matter content. Starting with the simplest methods using the velocity dispersion profiles I discuss the inherent issues of mass-anisotropy degeneracy and contamination by unbound stars. I then move on to methods of increasing complexity, aiming to break the degeneracy, up to recent applications of the Schwarzschild orbit superposition method. The dynamical modelling is placed in the context of possible scenarios for the formation of dwarf spheroidal galaxies, including the tidal stirring model and mergers of dwarf galaxies. The two scenarios are illustrated with examples from simulations: a comparison between the tidal evolution of dwarfs with cuspy and cored dark matter profiles and the formation of a dwarf spheroidal with prolate rotation.

Keywords

galaxies: dwarfgalaxies: evolutiongalaxies: interactionsgalaxies: kinematics and dynamicsgalaxies: structureLocal Groupdark matter
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. 239 - 245
Copyright
© International Astronomical Union 2020

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