Euclid preparation: XII. Optimizing the photometric sample of the Euclid survey for galaxy clustering and galaxy-galaxy lensing analyses

Understand

The accuracy of photometric redshifts (photo-zs) particularly affects the results of the analyses of galaxy clustering with photometrically-selected galaxies (GCph) and weak lensing.

• In the next decade, space missions like Euclid will collect photometric measurements for millions of galaxies.
• These data should be complemented with upcoming ground-based observations to derive precise and accurate photo-zs.
• In this paper, we explore how the tomographic redshift binning and depth of ground-based observations will affect the cosmological constraints expected from Euclid.