Euclid preparation XIX. Impact of magnification on photometric galaxy clustering

Euclid Collaboration

doi:10.1051/0004-6361/202142419

Euclid preparation XIX. Impact of magnification on photometric galaxy clustering

Euclid Collaboration

University of Geneva
University of Zurich
Campus UAB
Institut d’Estudis Espacials de Catalunya (IEEC)
INFN Sezione di Torino
University of Turin
Istituto di Astrofisica e Planetologia Spaziali (IAPS)
CEA/UVSQ/CNRS
Instituto de Fisica Teorica
Université St Joseph
IRAP/CNRS
Facultad de Ciencias Físicas y Matemáticas de la Universidad de Chile
University of Portsmouth
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
Max Planck Institut für Extraterrestrische Physik
Sezione di Roma
University Roma Tre
Osservatorio Astronomico di Capodimonte
Ipatimup Diagnósticos
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Campus Uab
The Barcelona Institute of Science and Technology
Osservatorio Astronomico di Roma
University of Naples Federico II
INFN Sezione di Napoli
Osservatorio Astrofisico Di Arcetri
University of Bologna
Université Paris-Sud
Centre National d'études Spatiales
University of Edinburgh, Institute for Astronomy
University of Manchester
ESRIN - ESA Centre for Earth Observation
ESAC campus
IGFL, Université de Lyon, Université Lyon 1
ENAC-IIC-GEL
Faculdade de Ciências, Universidade de Lisboa
Université de Genève
Université Paris-Saclay
INFN
Aix Marseille Université
Institut d’Astrophysique de Paris
INFN Sezione di Bologna
INAF Osservatorio Astronomico di Padova
Universität München
University of Milano
Sezione INFN di Milano
University of Oslo
Science Division
Von Hoerner & Sulger GmbH
Max-Planck-Institut für Astronomie
UCL Mullard Space Science Laboratory
University of Helsinki
ASTRON
INAF-Trieste
University Bonn
Durham University
Université Côte d’Azur
University of Applied Sciences and Arts of Northwestern Switzerland
California Institute of Technology
ESTEC - European Space Research and Technology Centre
Aarhus University
Perimeter Institute for Theoretical Physics
University of Waterloo
Institute of Space Sciences
University of Padova
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
Universidad Politécnica de Cartagena
University of Groningen
California Institute of Technology
Flatiron Institute
Cardiff University
Laboratoire de Probabilités et Modèles Aléatoires
University of Trieste
International School of Advanced Studies
INFN Sezione di Trieste
Research Unit; CIBERNED and Universidad de La Laguna
Instituto de Astrofisica de Canarias
University of Ferrara
Sezione di Genova
University of Oxford
Lancaster University
Sorbonne Univ.
University College London
Centre de Calcul de l’IN2P3
University of Rome
Heidelberg University
University of Heidelberg
Sezione di Lecce
University of Salento
University of Jyväskylä
Ruhr-University Bochum

Research output: Contribution to journal › Article › peer-review

Abstract

Aims. We investigate the importance of lensing magnification for estimates of galaxy clustering and its cross-correlation with shear for the photometric sample of Euclid. Using updated specifications, we study the impact of lensing magnification on the constraints and the shift in the estimation of the best fitting cosmological parameters that we expect if this effect is neglected. Methods. We follow the prescriptions of the official Euclid Fisher matrix forecast for the photometric galaxy clustering analysis and the combination of photometric clustering and cosmic shear. The slope of the luminosity function (local count slope), which regulates the amplitude of the lensing magnification, and the galaxy bias have been estimated from the Euclid Flagship simulation. Results. We find that magnification significantly affects both the best-fit estimation of cosmological parameters and the constraints in the galaxy clustering analysis of the photometric sample. In particular, including magnification in the analysis reduces the 1σ errors on Ω_m,0, w₀, w_a at the level of 20–35%, depending on how well we will be able to independently measure the local count slope. In addition, we find that neglecting magnification in the clustering analysis leads to shifts of up to 1.6σ in the best-fit parameters. In the joint analysis of galaxy clustering, cosmic shear, and galaxy–galaxy lensing, magnification does not improve precision, but it leads to an up to 6σ bias if neglected. Therefore, for all models considered in this work, magnification has to be included in the analysis of galaxy clustering and its cross-correlation with the shear signal (3 × 2pt analysis) for an accurate parameter estimation.

Original language	English
Article number	A93
Journal	Astronomy and Astrophysics
Volume	662
DOIs	https://doi.org/10.1051/0004-6361/202142419
Publication status	Published - 1 Jun 2022
Externally published	Yes

Keywords

cosmological parameters
cosmology: theory
large-scale structure of Universe

Access to Document

10.1051/0004-6361/202142419

Cite this

@article{7d26f703984748c1a4426d3a184f47c1,

title = "Euclid preparation XIX. Impact of magnification on photometric galaxy clustering",

abstract = "Aims. We investigate the importance of lensing magnification for estimates of galaxy clustering and its cross-correlation with shear for the photometric sample of Euclid. Using updated specifications, we study the impact of lensing magnification on the constraints and the shift in the estimation of the best fitting cosmological parameters that we expect if this effect is neglected. Methods. We follow the prescriptions of the official Euclid Fisher matrix forecast for the photometric galaxy clustering analysis and the combination of photometric clustering and cosmic shear. The slope of the luminosity function (local count slope), which regulates the amplitude of the lensing magnification, and the galaxy bias have been estimated from the Euclid Flagship simulation. Results. We find that magnification significantly affects both the best-fit estimation of cosmological parameters and the constraints in the galaxy clustering analysis of the photometric sample. In particular, including magnification in the analysis reduces the 1σ errors on Ωm,0, w0, wa at the level of 20–35\%, depending on how well we will be able to independently measure the local count slope. In addition, we find that neglecting magnification in the clustering analysis leads to shifts of up to 1.6σ in the best-fit parameters. In the joint analysis of galaxy clustering, cosmic shear, and galaxy–galaxy lensing, magnification does not improve precision, but it leads to an up to 6σ bias if neglected. Therefore, for all models considered in this work, magnification has to be included in the analysis of galaxy clustering and its cross-correlation with the shear signal (3 × 2pt analysis) for an accurate parameter estimation.",

keywords = "cosmological parameters, cosmology: theory, large-scale structure of Universe",

author = "\{Euclid Collaboration\} and F. Lepori and I. Tutusaus and C. Viglione and C. Bonvin and S. Camera and Castander, \{F. J.\} and R. Durrer and P. Fosalba and G. Jelic-Cizmek and M. Kunz and J. Adamek and S. Casas and M. Martinelli and Z. Sakr and D. Sapone and A. Amara and N. Auricchio and C. Bodendorf and D. Bonino and E. Branchini and M. Brescia and J. Brinchmann and V. Capobianco and C. Carbone and J. Carretero and M. Castellano and S. Cavuoti and A. Cimatti and R. Cledassou and G. Congedo and Conselice, \{C. J.\} and L. Conversi and Y. Copin and L. Corcione and F. Courbin and \{Da Silva\}, A. and H. Degaudenzi and M. Douspis and F. Dubath and X. Dupac and S. Dusini and A. Ealet and S. Farrens and S. Ferriol and E. Franceschi and M. Fumana and B. Garilli and W. Gillard and B. Gillis and F. Bernardeau",

note = "Publisher Copyright: c ESO 2022",

year = "2022",

month = jun,

day = "1",

doi = "10.1051/0004-6361/202142419",

language = "English",

volume = "662",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

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TY - JOUR

T1 - Euclid preparation XIX. Impact of magnification on photometric galaxy clustering

AU - Euclid Collaboration

AU - Lepori, F.

AU - Tutusaus, I.

AU - Viglione, C.

AU - Bonvin, C.

AU - Camera, S.

AU - Castander, F. J.

AU - Durrer, R.

AU - Fosalba, P.

AU - Jelic-Cizmek, G.

AU - Kunz, M.

AU - Adamek, J.

AU - Casas, S.

AU - Martinelli, M.

AU - Sakr, Z.

AU - Sapone, D.

AU - Amara, A.

AU - Auricchio, N.

AU - Bodendorf, C.

AU - Bonino, D.

AU - Branchini, E.

AU - Brescia, M.

AU - Brinchmann, J.

AU - Capobianco, V.

AU - Carbone, C.

AU - Carretero, J.

AU - Castellano, M.

AU - Cavuoti, S.

AU - Cimatti, A.

AU - Cledassou, R.

AU - Congedo, G.

AU - Conselice, C. J.

AU - Conversi, L.

AU - Copin, Y.

AU - Corcione, L.

AU - Courbin, F.

AU - Da Silva, A.

AU - Degaudenzi, H.

AU - Douspis, M.

AU - Dubath, F.

AU - Dupac, X.

AU - Dusini, S.

AU - Ealet, A.

AU - Farrens, S.

AU - Ferriol, S.

AU - Franceschi, E.

AU - Fumana, M.

AU - Garilli, B.

AU - Gillard, W.

AU - Gillis, B.

AU - Bernardeau, F.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - Aims. We investigate the importance of lensing magnification for estimates of galaxy clustering and its cross-correlation with shear for the photometric sample of Euclid. Using updated specifications, we study the impact of lensing magnification on the constraints and the shift in the estimation of the best fitting cosmological parameters that we expect if this effect is neglected. Methods. We follow the prescriptions of the official Euclid Fisher matrix forecast for the photometric galaxy clustering analysis and the combination of photometric clustering and cosmic shear. The slope of the luminosity function (local count slope), which regulates the amplitude of the lensing magnification, and the galaxy bias have been estimated from the Euclid Flagship simulation. Results. We find that magnification significantly affects both the best-fit estimation of cosmological parameters and the constraints in the galaxy clustering analysis of the photometric sample. In particular, including magnification in the analysis reduces the 1σ errors on Ωm,0, w0, wa at the level of 20–35%, depending on how well we will be able to independently measure the local count slope. In addition, we find that neglecting magnification in the clustering analysis leads to shifts of up to 1.6σ in the best-fit parameters. In the joint analysis of galaxy clustering, cosmic shear, and galaxy–galaxy lensing, magnification does not improve precision, but it leads to an up to 6σ bias if neglected. Therefore, for all models considered in this work, magnification has to be included in the analysis of galaxy clustering and its cross-correlation with the shear signal (3 × 2pt analysis) for an accurate parameter estimation.

AB - Aims. We investigate the importance of lensing magnification for estimates of galaxy clustering and its cross-correlation with shear for the photometric sample of Euclid. Using updated specifications, we study the impact of lensing magnification on the constraints and the shift in the estimation of the best fitting cosmological parameters that we expect if this effect is neglected. Methods. We follow the prescriptions of the official Euclid Fisher matrix forecast for the photometric galaxy clustering analysis and the combination of photometric clustering and cosmic shear. The slope of the luminosity function (local count slope), which regulates the amplitude of the lensing magnification, and the galaxy bias have been estimated from the Euclid Flagship simulation. Results. We find that magnification significantly affects both the best-fit estimation of cosmological parameters and the constraints in the galaxy clustering analysis of the photometric sample. In particular, including magnification in the analysis reduces the 1σ errors on Ωm,0, w0, wa at the level of 20–35%, depending on how well we will be able to independently measure the local count slope. In addition, we find that neglecting magnification in the clustering analysis leads to shifts of up to 1.6σ in the best-fit parameters. In the joint analysis of galaxy clustering, cosmic shear, and galaxy–galaxy lensing, magnification does not improve precision, but it leads to an up to 6σ bias if neglected. Therefore, for all models considered in this work, magnification has to be included in the analysis of galaxy clustering and its cross-correlation with the shear signal (3 × 2pt analysis) for an accurate parameter estimation.

KW - cosmological parameters

KW - cosmology: theory

KW - large-scale structure of Universe

U2 - 10.1051/0004-6361/202142419

DO - 10.1051/0004-6361/202142419

M3 - Article

AN - SCOPUS:85134043401

SN - 0004-6361

VL - 662

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A93

ER -

Euclid preparation XIX. Impact of magnification on photometric galaxy clustering

Abstract

Keywords

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