I. Apples to apples $A^2$: realistic galaxy simulated catalogs and photometric redshift predictions for next-generation surveys

Abstract

We present new mock catalogues for two of the largest stage-IV next-generation surveys in the optical and infrared: LSST and Euclid, based on an N-body simulation+semi-analytical cone with a posterior modification with \texttt{PhotReal}. This technique modifies the original photometry by using an empirical library of spectral templates to make it more realistic. The reliability of the catalogues is confirmed by comparing the obtained color-magnitude relation, the luminosity and mass function and the angular correlation function with those of real data. Consistent comparisons between the expected photometric redshifts for different surveys are also provided. Very deep near infrared surveys such as Euclid will provide very good performance ($\Delta z/(1+z)\sim 0.025-0.053$) down to $H\sim 24$ AB mag and up to $z\sim 3$ depending on the optical observations available from the ground whereas extremely deep optical surveys such as LSST will obtain an overall lower photometric redshift resolution ($\Delta z/(1+z)\sim 0.045$) down to $i\sim 27.5$ AB mag, being considerably improved ($\Delta z/(1+z)\sim 0.035$) if we restrict the sample down to i$\sim$24 AB mag. Those numbers can be substantially upgraded by selecting a subsample of galaxies with the best quality photometric redshifts. We finally discuss the impact that these surveys will have for the community in terms of photometric redshift legacy. This is the first of a series of papers where we set a framework for comparability between mock catalogues and observations with a particular focus on cluster surveys. The Euclid and LSST mocks are made publicly available in the following link: http://photmocks.obspm.fr/.

accepted in MNRAS. Mocks available in the following link: http://photmocks.obspm.fr/

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• Euclid preparation III. Galaxy cluster detection in the wide photometric survey, performance and algorithm selection
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• An Accurate Cluster Selection Function for the J-PAS Narrow-Band wide-field survey
• HI Intensity Mapping for Clustering-Based Redshift Estimation
• II. Apples to apples $A^2$: cluster selection functions for next-generation surveys
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• Growing up in a megalopolis: Environmental effects on galaxy evolution in a supercluster at z~0.65 in UKIDSS UDS
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• Cosmic distance determination from photometric redshift samples using BAO peaks only
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• Evolution of the real-space correlation function from next generation cluster surveys
• Spectroscopic confirmation of the galaxy clusters CARLA J0950+2743 at z=2.363, and CARLA-Ser J0950+2743 at z=2.243