LSST, ionizing radiation, units

After a frustrating time looking for a units bug (there wasn't one) in Wu's code, I went to Zeljko Ivezic's (UW) talk at the Columbia Astronomy Colloqium. He spoke about LSST and the relationship to SDSS, intellectually, technically, and scientifically. It was great (though I had to leave a few minutes early).

Prior to that, Schiminovich and I got close to a measurement of the ionizing radiation incident on the outskirts of the Milky Way from optically selected quasars. It looks from the data (and from models too) like we can straightforwardly extrapolate to 912 A (observed frame) despite the intergalactic medium.

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