Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratios

Using the first three years of data from the Dark Energy Survey (DES), we use ratios of small-scale galaxy-galaxy lensing measurements around the same lens sample to constrain source redshift uncertainties, intrinsic alignments and other systematics or nuisance parameters of our model. Instead of us...

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Detalles Bibliográficos
Autor: García-Bellido Capdevila, Juan
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/706206
Acceso en línea:http://hdl.handle.net/10486/706206
https://dx.doi.org/10.1103/PhysRevD.105.083529
Access Level:acceso abierto
Palabra clave:Weak
Gravitational Lensing
Dark Energy
Física
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spelling Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratiosGarcía-Bellido Capdevila, JuanWeakGravitational LensingDark EnergyFísicaUsing the first three years of data from the Dark Energy Survey (DES), we use ratios of small-scale galaxy-galaxy lensing measurements around the same lens sample to constrain source redshift uncertainties, intrinsic alignments and other systematics or nuisance parameters of our model. Instead of using a simple geometric approach for the ratios as has been done in the past, we use the full modeling of the galaxy-galaxy lensing measurements, including the corresponding integration over the power spectrum and the contributions from intrinsic alignments and lens magnification. We perform extensive testing of the small-scale shear-ratio (SR) modeling by studying the impact of different effects such as the inclusion of baryonic physics, nonlinear biasing, halo occupation distribution descriptions and lens magnification, among others, and using realistic N-body simulations of the DES data. We validate the robustness of our constraints in the data by using two independent lens samples with different galaxy properties, and by deriving constraints using the corresponding large-scale ratios for which the modeling is simpler. The results applied to the DES Y3 data demonstrate how the ratios provide significant improvements in constraining power for several nuisance parameters in our model, especially on source redshift calibration and intrinsic alignments. For source redshifts, SR improves the constraints from the prior by up to 38% in some redshift bins. Such improvements, and especially the constraints it provides on intrinsic alignments, translate to tighter cosmological constraints when shear ratios are combined with cosmic shear and other 2pt functions. In particular, for the DES Y3 data, SR improves S8 constraints from cosmic shear by up to 31%, and for the full combination of probes (3 × 2pt) by up to 10%. The shear ratios presented in this work are used as an additional likelihood for cosmic shear, 2 × 2pt and the full 3 × 2pt in the fiducial DES Y3 cosmological analysisAmerican Physical SocietyDepartamento de Física TeóricaFacultad de Ciencias20222022-04-26research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/706206https://dx.doi.org/10.1103/PhysRevD.105.083529reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/7062062026-06-23T12:46:27Z
dc.title.none.fl_str_mv Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratios
title Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratios
spellingShingle Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratios
García-Bellido Capdevila, Juan
Weak
Gravitational Lensing
Dark Energy
Física
title_short Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratios
title_full Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratios
title_fullStr Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratios
title_full_unstemmed Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratios
title_sort Dark Energy Survey Year 3 results: Exploiting small-scale information with lensing shear ratios
dc.creator.none.fl_str_mv García-Bellido Capdevila, Juan
author García-Bellido Capdevila, Juan
author_facet García-Bellido Capdevila, Juan
author_role author
dc.contributor.none.fl_str_mv Departamento de Física Teórica
Facultad de Ciencias
dc.subject.none.fl_str_mv Weak
Gravitational Lensing
Dark Energy
Física
topic Weak
Gravitational Lensing
Dark Energy
Física
description Using the first three years of data from the Dark Energy Survey (DES), we use ratios of small-scale galaxy-galaxy lensing measurements around the same lens sample to constrain source redshift uncertainties, intrinsic alignments and other systematics or nuisance parameters of our model. Instead of using a simple geometric approach for the ratios as has been done in the past, we use the full modeling of the galaxy-galaxy lensing measurements, including the corresponding integration over the power spectrum and the contributions from intrinsic alignments and lens magnification. We perform extensive testing of the small-scale shear-ratio (SR) modeling by studying the impact of different effects such as the inclusion of baryonic physics, nonlinear biasing, halo occupation distribution descriptions and lens magnification, among others, and using realistic N-body simulations of the DES data. We validate the robustness of our constraints in the data by using two independent lens samples with different galaxy properties, and by deriving constraints using the corresponding large-scale ratios for which the modeling is simpler. The results applied to the DES Y3 data demonstrate how the ratios provide significant improvements in constraining power for several nuisance parameters in our model, especially on source redshift calibration and intrinsic alignments. For source redshifts, SR improves the constraints from the prior by up to 38% in some redshift bins. Such improvements, and especially the constraints it provides on intrinsic alignments, translate to tighter cosmological constraints when shear ratios are combined with cosmic shear and other 2pt functions. In particular, for the DES Y3 data, SR improves S8 constraints from cosmic shear by up to 31%, and for the full combination of probes (3 × 2pt) by up to 10%. The shear ratios presented in this work are used as an additional likelihood for cosmic shear, 2 × 2pt and the full 3 × 2pt in the fiducial DES Y3 cosmological analysis
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-04-26
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/706206
https://dx.doi.org/10.1103/PhysRevD.105.083529
url http://hdl.handle.net/10486/706206
https://dx.doi.org/10.1103/PhysRevD.105.083529
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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