FBQ 0951+2635: Time delay and structure of the main lensing galaxy

As there is a long-standing controversy over the time delay between the two images of the gravitationally lensed quasar FBQ 0951+2635, we combined early and new optical light curves to robustly measure a delay of 13.5 ± 1.6 d (1σ interval). The new optical records covering the last 17 yr were also u...

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Authors: Shalyapin, Vyacheslav N., Goicoechea, Luis J., Ruiz-Hinojosa, Eleana
Format: article
Status:Published version
Publication Date:2025
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/391803
Online Access:http://hdl.handle.net/10261/391803
Access Level:Open access
Keyword:Gravitational lensing: strong
Galaxies: structure
Quasars: individual: FBQ 0951+2635
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spelling FBQ 0951+2635: Time delay and structure of the main lensing galaxyShalyapin, Vyacheslav N.Goicoechea, Luis J.Ruiz-Hinojosa, EleanaGravitational lensing: strongGalaxies: structureQuasars: individual: FBQ 0951+2635As there is a long-standing controversy over the time delay between the two images of the gravitationally lensed quasar FBQ 0951+2635, we combined early and new optical light curves to robustly measure a delay of 13.5 ± 1.6 d (1σ interval). The new optical records covering the last 17 yr were also used to trace the long-timescale evolution of the microlensing variability. Additionally, the new time-delay interval and a relatively rich set of further observational constraints allowed us to discuss the mass structure of the main lensing galaxy at a redshift of 0.26. This lens system is of particular interest because the external shear from secondary gravitational deflectors is relatively low, but the external convergence is one of the highest known. When modelling the galaxy as a singular power-law ellipsoid without hypotheses or priors on the power-law index, ellipticity, and position angle, we demonstrated that its mass profile is close to isothermal, and there is a good agreement between the shape of the mass distribution and that of the near-IR light. We also recovered the true mass scale of the galaxy. Finally, a constant mass-to-light ratio model also worked acceptably well.VNS acknowledges the Universidad de Cantabria (UC) and the Spanish Agencia Estatal de Investigacion (AEI) for financial support for a long stay at the UC in the period 2022–2024. This research has been supported by the grant PID2020-118990GB-I00 funded by MCIN/AEI/10.13039/501100011033.Peer reviewedEDP SciencesUniversidad de CantabriaAgencia Estatal de Investigación (España)Ministerio de Ciencia, Innovación y Universidades (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/391803reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-118990GB-I00https://doi.org/10.1051/0004-6361/202452234Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3918032026-05-22T06:33:51Z
dc.title.none.fl_str_mv FBQ 0951+2635: Time delay and structure of the main lensing galaxy
title FBQ 0951+2635: Time delay and structure of the main lensing galaxy
spellingShingle FBQ 0951+2635: Time delay and structure of the main lensing galaxy
Shalyapin, Vyacheslav N.
Gravitational lensing: strong
Galaxies: structure
Quasars: individual: FBQ 0951+2635
title_short FBQ 0951+2635: Time delay and structure of the main lensing galaxy
title_full FBQ 0951+2635: Time delay and structure of the main lensing galaxy
title_fullStr FBQ 0951+2635: Time delay and structure of the main lensing galaxy
title_full_unstemmed FBQ 0951+2635: Time delay and structure of the main lensing galaxy
title_sort FBQ 0951+2635: Time delay and structure of the main lensing galaxy
dc.creator.none.fl_str_mv Shalyapin, Vyacheslav N.
Goicoechea, Luis J.
Ruiz-Hinojosa, Eleana
author Shalyapin, Vyacheslav N.
author_facet Shalyapin, Vyacheslav N.
Goicoechea, Luis J.
Ruiz-Hinojosa, Eleana
author_role author
author2 Goicoechea, Luis J.
Ruiz-Hinojosa, Eleana
author2_role author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
Agencia Estatal de Investigación (España)
Ministerio de Ciencia, Innovación y Universidades (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Gravitational lensing: strong
Galaxies: structure
Quasars: individual: FBQ 0951+2635
topic Gravitational lensing: strong
Galaxies: structure
Quasars: individual: FBQ 0951+2635
description As there is a long-standing controversy over the time delay between the two images of the gravitationally lensed quasar FBQ 0951+2635, we combined early and new optical light curves to robustly measure a delay of 13.5 ± 1.6 d (1σ interval). The new optical records covering the last 17 yr were also used to trace the long-timescale evolution of the microlensing variability. Additionally, the new time-delay interval and a relatively rich set of further observational constraints allowed us to discuss the mass structure of the main lensing galaxy at a redshift of 0.26. This lens system is of particular interest because the external shear from secondary gravitational deflectors is relatively low, but the external convergence is one of the highest known. When modelling the galaxy as a singular power-law ellipsoid without hypotheses or priors on the power-law index, ellipticity, and position angle, we demonstrated that its mass profile is close to isothermal, and there is a good agreement between the shape of the mass distribution and that of the near-IR light. We also recovered the true mass scale of the galaxy. Finally, a constant mass-to-light ratio model also worked acceptably well.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/391803
url http://hdl.handle.net/10261/391803
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-118990GB-I00
https://doi.org/10.1051/0004-6361/202452234
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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 reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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