2014-03-06

seeing the whole Universe in a single galaxy

In the morning, Andrea Maccio (MPIA) gave a nice talk about making star-formation and AGN feedback in numerical simulations of galaxy formation much more realistic. He is very negative about the possibility that AGN can stop star formation: AGN emit jets, which punch through the central part of the ISM and don't really heat all of the necessary volume. He also showed that the the dark-energy equation of state can affect galaxy evolution, not because the dark energy has any direct effect on how structures form, but because it changes the timing of gravitational collapse and star-formation episodes. That got the audience all in a tizzy: Can we infer the dark-energy equation of state from the radial distribution of stars in a galaxy? The answer is no: It looks like this effect is strongly degenerate with feedback parameters, but it is super-intriguing.

Late in the day, Foreman-Mackey and I checked in with Dawson about the in-transit noise. She has some systems that show a very strong effect of higher noise in transit than out. We suggested improvements to the statistical tests, and Dawson will try to move to smaller and smaller planets tomorrow.

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