disk galaxies

Willman's one-week informal workshop (five participants?) on Local Group substructure and equivalents got off to a nice start today, with discussions about current and future surveys pertaining to the structure of the Milky Way and Local Group. There was pessimism about understanding anything about the Milky Way's accretion history from studies of the very nearby (<100 pc) stellar velocity field (something we have worked on a bit here).

In the afternoon, participant Lucio Mayer gave a nice talk in which he convinced me that a lot of the angular momentum problem and Tully–Fisher theory–observation discrepancies were highly resolution-dependent. Indeed, he showed that resolution is a much bigger effect than what is assumed about stellar feedback, at least for these problems, and at least for SPH simulations. That's news.

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