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Semantic Scholar Open Access 2026

Euclid preparation. Impact of redshift distribution uncertainties on the joint analysis of photometric galaxy clustering and weak gravitational lensing

Euclid Collaboration K. A. Bertmann A. Porredon V. Duret J. Fonseca H. Hildebrandt +495 lainnya
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One of the $\textit{Euclid}$ mission's key projects is the so-called 3$\times$2pt analysis, that is, the combination of cosmic shear, photometric galaxy clustering, and galaxy-galaxy lensing. Although $\textit{Euclid}$ has established quality requirements for the photo-$z$ accuracy needed for the weak lensing galaxy sample, no such requirements have been set for the photometric clustering sample. In this paper, we investigate the impact of redshift uncertainties on $\textit{Euclid}$'s photometric galaxy clustering analysis and its combination with weak gravitational lensing, focusing on data release 1 (DR1). In particular, we study whether having precise knowledge of the mean of the redshift distributions per bin is sufficient to avoid biases in the resulting cosmological constraints or whether accuracy in the higher-order moments of the distribution is required. We evaluate the results based on their constraining power on $w_{\mathrm{0}}$ and $w_{a}$ and define thresholds for the precision and accuracy of $\textit{Euclid}$'s redshift distribution of the photometric clustering sample. We find that the redshift distributions of the photometric clustering sample must be known at an accuracy of 0.004(1+$z$) in the mean in order to recover 80$\%$ of the constraining power in $\textit{Euclid}$'s DR1 $w_{\mathrm{0}}w_{a}$CDM 3$\times$2pt analysis. The impact of the uncertainty on the width is negligible, provided the mean redshift is constrained with sufficient accuracy. For most sources of redshift distribution error, attaining the requirement on the mean will also reduce uncertainty in the width well below the required level.

Topik & Kata Kunci

Physics

Penulis (500)

E

Euclid Collaboration K. A. Bertmann

A

A. Porredon

V

V. Duret

J

J. Fonseca

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H. Hildebrandt

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44801 Bochum

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Germany.

C

Centro de Investigaciones Energ'eticas

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Medioambientales y Tecnol'ogicas

4

40 AvenidaComplutense

2

28014 Madrid

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Spain

A

A. Universit'e

C

CNRSIN2p3

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M

Marseille

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France

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I. D. A. E. C. D. Espacco

U

U. Porto

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Caup

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Rua das Estrelas

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P. Porto

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Portugal

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4169-007 Porto

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D. Physics

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U. Cape

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Campus Uab

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08193 Barcelona

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I. D. E. D. Catalunya

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31400 Toulouse

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1. ViaP.Giuria

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Italy

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I. Torino

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20 viaOsservatorio

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1. P. Torinese

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Universit'e Paris-Saclay

I

I. D. Spatiale

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91405

O

Orsay

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28692 Villanueva de la Canada

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Madrid

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S. O. Mathematics

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U. Surrey

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Guildford

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GU2 7XH

U

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Inaf Brera

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28 ViaBrera

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20133 Milano

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V. G. 933

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40129 Bologna

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2. viaBeirut

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11 ViaG.B.Tiepolo

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34127 Trieste

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Infn

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Sezione di Trieste

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Via Bonomea 265

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D. Astronomia

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U. Bologna

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V. G. 932

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I. Bologna

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U. Genova

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33 viaDodecaneso

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6. ViaCinthia

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80126

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Napoli

I

I. -. Capodimonte

1

16 viaMoiariello

8

80131 Napoli

I

Institute for Astronomy

U

U. Edinburgh

R

R. Observatory

B

B. Hill

E

Edinburgh EH9 3HJ

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L. Observatory

L

Leiden University

5

55 Einsteinweg

2

2333 CC Leiden

T

The Netherlands

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Inaf-Iasf Milano

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20133 Milano

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00078 Monte Porzio Catone

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2. -. C. D. D. Fisica

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I. Naples

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Tenerife

E

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1

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00044 Frascati

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1

1. Universit'eClaudeBernardLyon

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I. Lyon

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s

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1

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Iuf

4

4. R. E. Fermi

6

69622 Villeurbanne

M

Mullard Space Science Laboratory

U

U. London

H

Holmbury St. Mary

D

Dorking

S

Surrey RH5 6NT

D

Departament de F'isica

F

F. Ciencias

U

Universidade Tecnica de Lisboa

C

C8 Edif'icio

C

C. Grande

P

P. Lisboa

1

1049-001 Lisboa

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D. O. Astronomy

U

U. Geneva

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1

1290 Versoix

S

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I

INFN-Padova

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8. viaMarzolo

3

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I

I. D. A. E. P. Spaziali

V

V. Cavaliere

1

100

0

00133 Roma

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Universit'e de Paris Cit'e

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Cea

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9

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APA MLA BibTeX
Bertmann, E.C.K.A., Porredon, A., Duret, V., Fonseca, J., Hildebrandt, H., Tutusaus, I. et al. (2026). Euclid preparation. Impact of redshift distribution uncertainties on the joint analysis of photometric galaxy clustering and weak gravitational lensing. https://www.semanticscholar.org/paper/6ef8ee98749704ba393d68d48aec1b2c07d2a226

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