[for yesterday:] I was pleased to find Cox et al on the construction of bulge-dominated galaxies from disk-dominated galaxies in merger simulations. They find that they cannot reproduce the observed properties of bulge-dominated galaxies without allowing for dissipational gas dynamics and rapid central star formation. I have been saying this in a hand-waving way for years, and I am very happy to see it all done quantitatively. This really does mean that we can observe the creation of new bulges by looking for starbursts and post-starburst galaxies, as we have been arguing since Quintero et al 2004.
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