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Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering

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Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering. / Euclid Collaboration.
In: Astronomy and Astrophysics, Vol. 662, A93, 24.06.2022.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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Euclid Collaboration. Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering. Astronomy and Astrophysics. 2022 Jun 24;662:A93. doi: 10.1051/0004-6361/202142419

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Euclid Collaboration. / Euclid preparation : XIX. Impact of magnification on photometric galaxy clustering. In: Astronomy and Astrophysics. 2022 ; Vol. 662.

Bibtex

@article{d61bec8a5e284c5c8353de7a51506c70,
title = "Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering",
abstract = " 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. 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, as well as the galaxy bias have been estimated from the Euclid Flagship simulation. 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 1$\sigma$ errors on $\Omega_{\text{m},0}, w_{0}, w_a$ 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 1.6$\sigma$ in the best-fit parameters. In the joint analysis of galaxy clustering, cosmic shear and galaxy-galaxy lensing, including magnification does not improve precision but it leads to up to 6$\sigma$ 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 ($3\times2$pt analysis) for an accurate parameter estimation. ",
keywords = "large-scale structure of Universe, cosmological parameters, cosmology: theory",
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 Silva, {A. Da} 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 Hook, {I. M.}",
note = "The final, definitive version of this article has been published in the Journal, Astronomy & Astrophysics, 662, A93, 2022, {\textcopyright} EDP Sciences.",
year = "2022",
month = jun,
day = "24",
doi = "10.1051/0004-6361/202142419",
language = "English",
volume = "662",
journal = "Astronomy and Astrophysics",
issn = "1432-0746",
publisher = "EDP Sciences",

}

RIS

TY - JOUR

T1 - Euclid preparation

T2 - 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 - Silva, A. Da

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 - Hook, I. M.

N1 - The final, definitive version of this article has been published in the Journal, Astronomy & Astrophysics, 662, A93, 2022, © EDP Sciences.

PY - 2022/6/24

Y1 - 2022/6/24

N2 - 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. 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, as well as the galaxy bias have been estimated from the Euclid Flagship simulation. 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 1$\sigma$ errors on $\Omega_{\text{m},0}, w_{0}, w_a$ 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 1.6$\sigma$ in the best-fit parameters. In the joint analysis of galaxy clustering, cosmic shear and galaxy-galaxy lensing, including magnification does not improve precision but it leads to up to 6$\sigma$ 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 ($3\times2$pt analysis) for an accurate parameter estimation.

AB - 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. 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, as well as the galaxy bias have been estimated from the Euclid Flagship simulation. 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 1$\sigma$ errors on $\Omega_{\text{m},0}, w_{0}, w_a$ 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 1.6$\sigma$ in the best-fit parameters. In the joint analysis of galaxy clustering, cosmic shear and galaxy-galaxy lensing, including magnification does not improve precision but it leads to up to 6$\sigma$ 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 ($3\times2$pt analysis) for an accurate parameter estimation.

KW - large-scale structure of Universe

KW - cosmological parameters

KW - cosmology: theory

U2 - 10.1051/0004-6361/202142419

DO - 10.1051/0004-6361/202142419

M3 - Journal article

VL - 662

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 1432-0746

M1 - A93

ER -