Published in "Tidal Streams in the Local Group and Beyond: Observations and Implications", Astrophysics and Space Science Library, Volume 420. ISBN 978-3-319-19335-9. Springer International Publishing Switzerland, 2016.
http://arxiv.org/abs/1603.06601

For a PDF version of the article, click here.

ORIGINS AND INTERPRETATION OF TIDAL DEBRIS

Kathryn V. Johnston


Columbia University


Abstract: The stellar debris structures that have been discovered around the Milky Way and other galaxies are thought to be formed from the disruption of satellite stellar systems — dwarf galaxies or globular clusters — by galactic tidal fields. The total stellar mass in these structures is typically tiny compared to the galaxy around which they are found, and it is hence easy to dismiss them as inconsequential. However, they are remarkably useful as probes of a galaxy's history (as described in this chapter) and mass distribution (covered in a companion chapter in this volume). This power is actually a consequence of their apparent insignificance: their low contribution to the overall mass makes the physics that describes them both elegant and simple and this means that their observed properties are relatively easy to understand and interpret.


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