catalog level

In thinking about creating a generative model of every astronomical image ever taken, the Astrometry.net team has been considering what is possible at catalog level; that is, what can you do with the catalogs alone, without going to pixels. In the spirit of exploring that, Schiminovich and I started by just matching the GALEX catalogs to the SDSS catalogs. This will not produce the most sensitive possible match because there may be sources in each catalog that are below the detection limit but nonetheless detectable given prior information from the other catalog. I got to the point of an angular distance distribution for GALEX vs SDSS; as Schiminovich predicted, it has a width of about 2 arcsec.

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