stellar streams

Sergey Koposov and I spent time talking about finding streams in the SDSS imaging, using things akin to matched filters. Matched filters are very frequentist; they involve differencing integrals of the data. I prefer similar methods but that involve fitting distributions to the data that are more bayesian, but either way, it is clear that there is a lot of information in the color–magnitude space that is complementary to the information in angle space, and there also appears to be information in the proper-motion space. I would like us to try using it all.