Today Kate Storey-Fisher (NYU) and I discussed how to estimate the stellar contamination of her Gaia and WISE quasar catalog. Because there are few large, complete samples of anything, it’s hard to do this by comparison with any kind of Ground Truth™. What we realized on the call is that it’s easier to estimate how the contamination *changed* as we went from the Gaia quasar candidate table to our final sample. We discussed how to use what external data we have to estimate this.
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