massive groups, alpha

At the afternoon astro seminar, Ann Zabludoff (Arizona but on sabbatical at NYU) told us about galaxy groups at intermediate redshift, in the context of lensing (where there are groups contributing significantly to many of the strong lens systems, something I used to work on back in graduate school), and in the context of the baryon census, where she finds a large fraction of the baryons in stars in the intergroup but intragalactic space (about thirty percent of the stars, and between a few and tens of percent of the total baryonic content, depending on mass).

We decided that we can begin to go alpha with astrometry.net next week!

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