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The time evolution of gaps in tidal streams in axisymmetric potentials

Published online by Cambridge University Press:  07 March 2018

Helmer H. Koppelman  and
Amina Helmi
Helmer H. Koppelman
Affiliation:
Kapteyn Instituut, University of Groningen, P.O. Box 800, 9700 AV, Groningen, the Netherlands email: h.h.koppelman@rug.nl
Amina Helmi
Affiliation:
Kapteyn Instituut, University of Groningen, P.O. Box 800, 9700 AV, Groningen, the Netherlands email: h.h.koppelman@rug.nl
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Abstract

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Our goal is to understand the evolution and properties of gaps produced by dark matter subhalos in stellar tidal streams. Here we explore how gaps grow in spherical potentials in comparison to axisymmetric potentials. We develop a model that uses the divergence of two orbits, one on each side of the gap, to describe the size of the gap and how this varies with time and depends on the characteristics of the encounter with the dark subhalo. To this end we use a formalism based on action-angle variables.

Keywords

Galaxy: haloGalaxy: structureGalaxy: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 229 - 230
Copyright
Copyright © International Astronomical Union 2018 

References

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