merger origin of the halo, GALEX

Adi Zolotov—spending this year at Haverford with Willman—was back in the city today, and we spent some hours talking about projects. Her big project is about the signatures of hierarchical galaxy formation in the straightforward observables available to us from halo stars, such as spatial distributions, metallicities, and kinematics. She is developing a theory-motivated set of observational tests that will be sensitive to merger history.

Chris Martin (Caltech) came and gave the Physics Colloquium. He spoke about the GALEX satellite, with a focus on technical and hardware aspects. It was beautiful stuff.

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