T. J. Cox (Harvard) gave a nice seminar at the MPIA today about merging disk galaxies in realistic simulations. He does a nice job of creating a huge diversity of spheroidal galaxies, with gas content and/or dissipation one of the dominant parameters. He (indirectly) confirms my methodologies for constraining the galaxy–galaxy merger rate and growth rate of spheroidal galaxies.
Today Lang and I ruled out the streams we have been finding in 5D this week. There is structure in the data that is almost certainly systematic, not real.