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

Pocino, A., Tutusaus, I., Castander, F. J., Fosalba, P., Crocce, M., Porredon, A., et al. (2021). Euclid preparation - XII. Optimizing the photometric sample of the Euclid survey for galaxy clustering and galaxy-galaxy lensing analyses. Astronomy and Astrophysics, 655: A44. doi:10.1051/0004-6361/202141061.

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Pocino, A., Author
Tutusaus, I., Author
Castander, F. J., Author
Fosalba, P., Author
Crocce, M., Author
Porredon, A., Author
Camera, S., Author
Cardone, V., Author
Casas, S., Author
Kitching, T., Author
Lacasa, F., Author
Martinelli, M., Author
Pourtsidou, A., Author
Sakr, Z., Author
Andreon, S., Author
Auricchio, N., Author
Baccigalupi, C., Author
Balaguera-Antolínez, A., Author
Baldi, M., Author
Balestra, A., Author
Bardelli, S., AuthorBender, R.1, Author              Biviano, A., AuthorBodendorf, C.1, Author              Bonino, D., AuthorBoucaud, A., AuthorBozzo, E., AuthorBranchini, E., AuthorBrescia, M., AuthorBrinchmann, J., AuthorBurigana, C., AuthorCabanac, R., AuthorCapobianco, V., AuthorCappi, A., AuthorCarvalho, C. S., AuthorCastellano, M., AuthorCastignani, G., AuthorCavuoti, S., AuthorCimatti, A., AuthorCledassou, R., AuthorColodro-Conde, C., AuthorCongedo, G., AuthorConselice, C. J., AuthorConversi, L., AuthorCopin, Y., AuthorCorcione, L., AuthorCostille, A., AuthorCoupon, J., AuthorCourtois, H. M., AuthorCropper, M., AuthorCuby, J.-G., AuthorSilva, A. Da, Authorde la Torre, S., AuthorFerdinando, D. Di, AuthorDubath, F., AuthorDuncan, C., AuthorDupac, X., AuthorDusini, S., AuthorFarrens, S., AuthorFerreira, P. G., AuthorFerrero, I., AuthorFinelli, F., AuthorFotopoulou, S., AuthorFrailis, M., AuthorFranceschi, E., AuthorGaleotta, S., AuthorGarilli, B., AuthorGillard, W., AuthorGillis, B., AuthorGiocoli, C., AuthorGozaliasl, G., AuthorGraciá-Carpio, J.2, Author              Grupp, F.1, Author              Guzzo, L., AuthorHolmes, W., AuthorHormuth, F., AuthorJahnke, K., AuthorKeihanen, E., AuthorKermiche, S., AuthorKiessling, A., AuthorKirkpatrick, C. C., AuthorKunz, M., AuthorKurki-Suonio, H., AuthorLigori, S., AuthorLilje, P. B., AuthorLloro, I., AuthorMaino, D., AuthorMaiorano, E., AuthorMansutti, O., AuthorMarggraf, O., AuthorMartinet, N., AuthorMarulli, F., AuthorMassey, R., AuthorMaurogordato, S., AuthorMedinaceli, E., AuthorMei, S., AuthorMeneghetti, M., AuthorMetcalf, R. Benton, AuthorMeylan, G., AuthorMoresco, M., AuthorMorin, B., AuthorMoscardini, L., AuthorMunari, E., AuthorNakajima, R., AuthorNeissner, C., AuthorNichol, R. C., AuthorNiemi, S., AuthorNightingale, J., AuthorPadilla, C., AuthorPaltani, S., AuthorPasian, F., AuthorPatrizii, L., AuthorPedersen, K., AuthorPercival, W. J., AuthorPettorino, V., AuthorPires, S., AuthorPolenta, G., AuthorPoncet, M., AuthorPopa, L., AuthorPotter, D., AuthorPozzetti, L., AuthorRaison, F.1, Author              Renzi, A., AuthorRhodes, J., AuthorRiccio, G., AuthorRomelli, E., AuthorRoncarelli, M., AuthorRossetti, E., AuthorSaglia, R.1, Author              Sánchez, A. G.1, Author              Sapone, D., AuthorScaramella, R., AuthorSchneider, P., AuthorScottez, V., AuthorSecroun, A., AuthorSeidel, G., AuthorSerrano, S., AuthorSirignano, C., AuthorSirri, G., AuthorStanco, L., AuthorSureau, F., AuthorTaylor, A. N., AuthorTenti, M., AuthorTereno, I., AuthorTeyssier, R., AuthorToledo-Moreo, R., AuthorTramacere, A., AuthorValentijn, E. A., AuthorValenziano, L., AuthorValiviita, J., AuthorVassallo, T., AuthorViel, M., AuthorWang, Y., AuthorWelikala, N., AuthorWhittaker, L., AuthorZacchei, A., AuthorZamorani, G., AuthorZoubian, J., AuthorZucca, E., Author more..
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              
2Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              


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 Abstract: Photometric redshifts (photo-zs) are one of the main ingredients in the analysis of cosmological probes. Their accuracy particularly affects the results of the analyses of galaxy clustering with photometrically selected galaxies (GCph) and weak lensing. In the next decade, space missions such as Euclid will collect precise and accurate 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 article we explore how the tomographic redshift binning and depth of ground-based observations will affect the cosmological constraints expected from the Euclid mission. We focus on GCph and extend the study to include galaxy-galaxy lensing (GGL). We add a layer of complexity to the analysis by simulating several realistic photo-z distributions based on the Euclid Consortium Flagship simulation and using a machine learning photo-z algorithm. We then use the Fisher matrix formalism together with these galaxy samples to study the cosmological constraining power as a function of redshift binning, survey depth, and photo-z accuracy. We find that bins with an equal width in redshift provide a higher figure of merit (FoM) than equipopulated bins and that increasing the number of redshift bins from ten to 13 improves the FoM by 35% and 15% for GCph and its combination with GGL, respectively. For GCph, an increase in the survey depth provides a higher FoM. However, when we include faint galaxies beyond the limit of the spectroscopic training data, the resulting FoM decreases because of the spurious photo-zs. When combining GCph and GGL, the number density of the sample, which is set by the survey depth, is the main factor driving the variations in the FoM. Adding galaxies at faint magnitudes and high redshift increases the FoM, even when they are beyond the spectroscopic limit, since the number density increase compensates for the photo-z degradation in this case. We conclude that there is more information that can be extracted beyond the nominal ten tomographic redshift bins of Euclid and that we should be cautious when adding faint galaxies into our sample since they can degrade the cosmological constraints.


Language(s): eng - English
 Dates: 2021-11-11
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202141061
 Degree: -



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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 655 Sequence Number: A44 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1