dimensionless numbers

My morning started with a great call with Ana Bonaca (Harvard): She can make a very simple simulation of a cold stream that creates a gap in the stream and a spur of stars off the stream from the gap, looking extremely similar to the features found by her and Price-Whelan in the GD-1 stream in Gaia. We are looking at doing a little perturbative physics and building an atlas of possible stream features, in different physical regimes. We discussed a bit the first set of figures. Part of the point of the project is to work out all the dimensionless numbers that put stream interactions (with, say, dark-matter substructures) into different calculational regimes.

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