Euclid Quick Data Release (Q1)
K. RojasInstitute of Cosmology and Gravitation, University of PortsmouthT.E CollettInstitute of Cosmology and Gravitation, University of PortsmouthJ.A. Acevedo BarrosoInstitute of Physics, Laboratory of Astrophysics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de SauvernyJ.W NightingaleSchool of Mathematics, Statistics and Physics, Newcastle University, Herschel BuildingDaniel SternJet Propulsion Laboratory, California Institute of TechnologyLeonidas A. MoustakasJet Propulsion Laboratory, California Institute of TechnologyS. SchuldtINAF-IASF MilanoG. DespaliINAF-Osservatorio di Astrofisica e Scienza dello Spazio di BolognaAnely Maciel de MeloMax-Planck-Institut für AstrophysikM. WalmsleyDavid A. Dunlap Department of Astronomy & Astrophysics, University of TorontoDavid BallardSydney Institute for Astronomy, School of Physics, University of SydneyW.J.R. EnziInstitute of Cosmology and Gravitation, University of PortsmouthTian LiInstitute of Cosmology and Gravitation, University of PortsmouthA Sainz de MurietaInstitute of Cosmology and Gravitation, University of PortsmouthI. T. AndikaMax-Planck-Institut für AstrophysikBenjamin ClémentInstitute of Physics, Laboratory of Astrophysics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de SauvernyF. CourbinInstitució Catalana de Recerca i Estudis Avançats (ICREA)L.R EckerMax Planck Institute for Extraterrestrial PhysicsR. GavazziInstitut d'Astrophysique de ParisN. JacksonJodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of ManchesterAttila KovácsMTA-CSFK Lendület Large-Scale Structure Research GroupPredrag MatavuljUniversity of Applied Sciences and Arts of Northwestern Switzerland, School of EngineeringM. MeneghettiINFN-Sezione di BolognaS. SerjeantSchool of Physical Sciences, The Open UniversityDominique SluseSTAR Institute, University of LiègeC. TortoraINAF-Osservatorio Astronomico di CapodimonteA. VermaDepartment of Physics, Oxford UniversityL. MarchettiAstronomical Institute of the Slovak Academy of SciencesConor M. O’RiordanMax-Planck-Institut für AstrophysikKathryn McCarthyJet Propulsion Laboratory, California Institute of TechnologyS. H. SuyuTechnical University of Munich, TUM School of Natural Sciences, Physics DepartmentR. B. MetcalfDipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Università di BolognaJ. M. DiegoUniversité Paris-SaclayN.E.P. LinesInstitute of Cosmology and Gravitation, University of PortsmouthN. AghanimESAC/ESAB. AltieriSchool of Mathematics and Physics, University of SurreyA. AmaraINAF-Osservatorio Astronomico di BreraS. AndreonCEA Paris-SaclayN. AuricchioINAF-Osservatorio di Astrofisica e Scienza dello Spazio di BolognaH. AusselIFPU, Institute for Fundamental Physics of the UniverseC. BaccigalupiINFN, Sezione di TriesteMarco BaldiINAF-Osservatorio Astronomico di PadovaA. BalestraUnited Kingdom Space AgencyS BardelliINAF-Osservatorio di Astrofisica e Scienza dello Spazio di BolognaP. BattagliaINAF-Osservatorio di Astrofisica e Scienza dello Spazio di BolognaR. BenderMax Planck Institute for Extraterrestrial PhysicsA. BivianoINAF-Osservatorio Astronomico di TriesteA. BonchiDipartimento di Fisica, Università di GenovaE. BranchiniDepartment of Physics “E. Pancini”, University Federico IIM. BresciaINAF-Osservatorio Astronomico di CapodimonteJ. BrinchmannDipartimento di Fisica, Università degli Studi di TorinoS. CameraINAF-Osservatorio Astrofisico di TorinoG Cañas-HerreraINAF-Osservatorio Astronomico di RomaV. CapobiancoEuropean Space Research and Technology CentreV.F CardoneINAF-IASF MilanoV.F CardoneINFN-Sezione di RomaJ. CarreteroPort d’Informació Científica, Campus UABSantiago CasasNaples Anesthesia & Physician AssociatesM. CastellanoINFN-Sezione di RomaG. CastignaniINAF-Osservatorio di Astrofisica e Scienza dello Spazio di BolognaS CavuotiInstitute for Astronomy, University of HawaiiK. C. ChambersDipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Università di BolognaA. CimattiInstituto de Astrofísica de CanariasC. Colodro-CondeInstitute for Astronomy, University of Edinburgh, Royal ObservatoryG. CongedoEuropean Space Research InstituteChristopher J. ConseliceJodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of ManchesterL. ConversiUniversité Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822Y. CopinLyon CollegeH. M. CourtoisMullard Space Science Laboratory, University College LondonM. CropperDepartamento de Física, Faculdade de Ciências, Universidade de LisboaA. Da SilvaDepartment of Astronomy, University of GenevaH. DegaudenziINAF-Istituto di Astrofisica e Planetologia SpazialiG. De LuciaINFN, Sezione di TriesteA. M. Di GiorgioAix-Marseille Université, CNRS/IN2P3, CPPMC. DoldingDepartamento de Física, Faculdade de Ciências, Universidade de LisboaH. DoleESAC/ESAF DubathINAF-Istituto di Astrofisica e Planetologia SpazialiX. DupacSchool of Mathematics and Physics, University of SurreyS. EscoffierINFN-BolognaM. FabriciusUniversitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität MünchenM. FarinaCentre de physique des particules de MarseilleR. FarinelliINAF-Osservatorio di Astrofisica e Scienza dello Spazio di BolognaF. FaustiniDipartimento di Fisica, Università di GenovaS. FerriolLyon CollegeF. Finelli⋆Osservatorio di Astrofisica e Scienza dello SpazioS. FotopoulouFRACTAL S.L.N.EM. FrailisINFN, Sezione di TriesteE. FranceschiINAF-Osservatorio di Astrofisica e Scienza dello Spazio di BolognaS. GaleottaINFN, Sezione di TriesteKoshy GeorgeUniversitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität MünchenW GillardINFN-BolognaB GillisEuropean Space Agency/ESRINC. GiocoliINAF-Osservatorio di Astrofisica e Scienza dello Spazio di BolognaP. Gómez-AlvarezINFN-Sezione di MilanoJ. Gracia-CarpioMax Planck Institute for Extraterrestrial PhysicsB. R. GranettCommissariat à l'Énergie Atomique et aux Énergies AlternativesA. GrazianUnited Kingdom Space AgencyF. GruppUniversitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität MünchenL. GuzzoCommissariat à l'Énergie Atomique et aux Énergies AlternativesS GwynInstitute of Theoretical Astrophysics, University of Oslo
2025en
ABI
Abstract
We present a search for strong gravitational lenses in Euclid imaging with a high stellar velocity dispersion ( σ v > 180 km s −1 ) reported by SDSS and DESI. We performed expert visual inspection and classification of 11 660 Euclid images. We discovered 38 grade A and 40 grade B candidate lenses, which is consistent with an expected sample of ∼32. Palomar spectroscopy confirmed 5 lens systems, while DESI spectra confirmed one system, provided ambiguous results for another, and helped to discard a third system. The Euclid automated lens modeler modelled 53 candidates, confirmed 38 as lenses, failed to model 9, and ruled out 6 grade B candidates. For the remaining 25 candidates, we were unable to gather additional information. More importantly, our classified non-lenses provide an excellent training set for machine-learning lens classifiers. We created high-fidelity simulations of Euclid lenses by painting realistic lensed sources behind the tagged (non-lens) luminous red galaxies. This training set is the foundation stone for the Euclid galaxy-galaxy strong-lensing discovery engine.