Today Kate Storey-Fisher (NYU) arrived in Heidelberg and we worked on improving the ESA Gaia DR3 quasar redshifts, using NASA WISE and IRAS information. We were trying to reproduce experiments performed by Hans-Walter Rix (MPIA) last week. It looks like we can get clean-ish samples, where more than 90 percent of the redshifts are correct (as compared to ground-based spectroscopic surveys), provided that we stick to bright quasars. The question is: Is this good enough for our cosmological goals? We discussed how to empirically evaluate the selection function, which is our next task.
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