Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologies

Euclid’s photometric galaxy cluster survey has the potential to be a very competitive cosmological probe. The main cosmological probe with observations of clusters is their number count, within which the halo mass function (HMF) is a key theoretical quantity. We present a new calibration of the anal...

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Detalles Bibliográficos
Autores: Courbin, Frédéric, Carretero, Jorge, Fosalba, Pablo, Castro, Tiago, Euclid Collaboration
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/220744
Acceso en línea:https://hdl.handle.net/2445/220744
Access Level:acceso abierto
Palabra clave:Galàxies
Telescopis espacials
Cosmologia
Aprenentatge automàtic
Galaxies
Space telescopes
Cosmology
Machine learning
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spelling Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologiesCourbin, FrédéricCarretero, JorgeFosalba, PabloCastro, TiagoEuclid CollaborationGalàxiesTelescopis espacialsCosmologiaAprenentatge automàticGalaxiesSpace telescopesCosmologyMachine learningEuclid’s photometric galaxy cluster survey has the potential to be a very competitive cosmological probe. The main cosmological probe with observations of clusters is their number count, within which the halo mass function (HMF) is a key theoretical quantity. We present a new calibration of the analytic HMF, at the level of accuracy and precision required for the uncertainty in this quantity to be subdominant with respect to other sources of uncertainty in recovering cosmological parameters from Euclid cluster counts. Our model is calibrated against a suite of N-body simulations using a Bayesian approach taking into account systematic errors arising from numerical effects in the simulation. First, we test the convergence of HMF predictions from different N-body codes, by using initial conditions generated with different orders of Lagrangian Perturbation theory, and adopting different simulation box sizes and mass resolution. Then, we quantify the effect of using different halo finder algorithms, and how the resulting differences propagate to the cosmological constraints. In order to trace the violation of universality in the HMF, we also analyse simulations based on initial conditions characterised by scale-free power spectra with different spectral indexes, assuming both Einstein–de Sitter and standard ΛCDM expansion histories. Based on these results, we construct a fitting function for the HMF that we demonstrate to be sub-percent accurate in reproducing results from 9 different variants of the ΛCDM model including massive neutrinos cosmologies. The calibration systematic uncertainty is largely sub-dominant with respect to the expected precision of future mass–observation relations; with the only notable exception of the effect due to the halo finder, that could lead to biased cosmological inference.EDP Sciences2023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/220744Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1051/0004-6361/202244674Astronomy & Astrophysics, 2023, vol. 671, num.A100https://doi.org/10.1051/0004-6361/202244674(c) The European Southern Observatory (ESO), 2023info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2207442026-05-27T06:46:51Z
dc.title.none.fl_str_mv Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologies
title Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologies
spellingShingle Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologies
Courbin, Frédéric
Galàxies
Telescopis espacials
Cosmologia
Aprenentatge automàtic
Galaxies
Space telescopes
Cosmology
Machine learning
title_short Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologies
title_full Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologies
title_fullStr Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologies
title_full_unstemmed Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologies
title_sort Euclid preparation: XXIV. Calibration of the halo mass function in (?)CDM cosmologies
dc.creator.none.fl_str_mv Courbin, Frédéric
Carretero, Jorge
Fosalba, Pablo
Castro, Tiago
Euclid Collaboration
author Courbin, Frédéric
author_facet Courbin, Frédéric
Carretero, Jorge
Fosalba, Pablo
Castro, Tiago
Euclid Collaboration
author_role author
author2 Carretero, Jorge
Fosalba, Pablo
Castro, Tiago
Euclid Collaboration
author2_role author
author
author
author
dc.subject.none.fl_str_mv Galàxies
Telescopis espacials
Cosmologia
Aprenentatge automàtic
Galaxies
Space telescopes
Cosmology
Machine learning
topic Galàxies
Telescopis espacials
Cosmologia
Aprenentatge automàtic
Galaxies
Space telescopes
Cosmology
Machine learning
description Euclid’s photometric galaxy cluster survey has the potential to be a very competitive cosmological probe. The main cosmological probe with observations of clusters is their number count, within which the halo mass function (HMF) is a key theoretical quantity. We present a new calibration of the analytic HMF, at the level of accuracy and precision required for the uncertainty in this quantity to be subdominant with respect to other sources of uncertainty in recovering cosmological parameters from Euclid cluster counts. Our model is calibrated against a suite of N-body simulations using a Bayesian approach taking into account systematic errors arising from numerical effects in the simulation. First, we test the convergence of HMF predictions from different N-body codes, by using initial conditions generated with different orders of Lagrangian Perturbation theory, and adopting different simulation box sizes and mass resolution. Then, we quantify the effect of using different halo finder algorithms, and how the resulting differences propagate to the cosmological constraints. In order to trace the violation of universality in the HMF, we also analyse simulations based on initial conditions characterised by scale-free power spectra with different spectral indexes, assuming both Einstein–de Sitter and standard ΛCDM expansion histories. Based on these results, we construct a fitting function for the HMF that we demonstrate to be sub-percent accurate in reproducing results from 9 different variants of the ΛCDM model including massive neutrinos cosmologies. The calibration systematic uncertainty is largely sub-dominant with respect to the expected precision of future mass–observation relations; with the only notable exception of the effect due to the halo finder, that could lead to biased cosmological inference.
publishDate 2023
dc.date.none.fl_str_mv 2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/220744
url https://hdl.handle.net/2445/220744
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1051/0004-6361/202244674
Astronomy & Astrophysics, 2023, vol. 671, num.A100
https://doi.org/10.1051/0004-6361/202244674
dc.rights.none.fl_str_mv (c) The European Southern Observatory (ESO), 2023
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The European Southern Observatory (ESO), 2023
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812455

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