stream perturbations

Spent time with Johnston today at Columbia and she encouraged me to dust off my manuscript on perturbations of cold streams by compact substructures. We realized that there are already morphological features in the known streams that could be analyzed, at least roughly, in terms of perturbations by substructures. I started to get her to agree that the smoothness and straightness of streams like GD-1 already make them interesting for the dark-matter model. But we both agreed that we can't be quantitative about that until we understand how the disruption of streams by substructure affects their detectability.

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