Milky Way masers

Masers are incredibly bright, compact emission regions in the Galaxy that permit measurements of full six-dimensional phase-space position. Reid (Harvard) has a sample of 18 that he used to measure the mass of the Milky Way. Rix, Bovy, and I spent an inordinate amount of time criticizing the Reid method, although we are not sure we can do better. We also involved Johnston and Weinberg (UMASS) in our discussions.

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