Accès ouvert déclaré
2026
preprint
Euclid Quick Data Release (Q2) -- The Euclid Galactic Bulge Survey
JP Beaulieu, E. Bachelet, M. Gilles, C. Ranc, E. N. Rektsini, E. Kerins, M. T. Penny, H. Verma, S. Mottet, R. Vavrek, V. Bozza, J. -C. Cuillandre, M. Chang, L. R. Bedin, K. Kuijken, C Laigle, M. Libralato, I. McDonald, R. Nakajima, V. Popoff, J Rhodes, E. Thygesen, S. Awan, J. E. Davies, A. M. Di Giorgio, T. Flanet, C. Grenet, O. Herent, P. Hudelot, K. Jahnke, R. Kohley, H. J. McCracken, H.N. Nguyen-Kim, M. Gabrielle Pagé, M. Schirmer, F. Soldano, B. Altieri, S. Andreon, N. Auricchio, H. Aussel, C Baccigalupi, M. Baldi, A. Balestra, S. Bardelli, P. Battaglia, R. Bender, A. Biviano, M Brescia, S. Camera, V. Capobianco, C. Carbone, V. F. Cardone, J. Carretero, M. Castellano, G. Castignani, S Cavuoti, A Cimatti, C. Colodro-Conde, G. Congedo, C J Conselice, L. Conversi, Y. Copin, F. Courbin, H M Courtois, M. Cropper, H. Degaudenzi, G. De Lucia, C. Dolding, H. Dole, F. Dubath, X. Dupac, S. Dusini, S. Escoffier, M. Farina, R. Farinelli, F. Faustini, S. Ferriol, F. Finelli, S. Fotopoulou, N. Fourmanoit, M. Frailis, L. Gabarra, S. Galeotta, W Gillard, B. Gillis, C Giocoli, P. Gómez-Alvarez, A. Grazian, F. Grupp, L Guzzo, W G Hartley, S. V. H. Haugan, G. Helou, S. Hemmati, H. Hoekstra, W. Holmes, I. M. Hook, F. Hormuth, A. Hornstrup, M. Jhabvala, B. Joachimi, S Kermiche, B. Kubik, M. Kümmel, M. Kunz, H. Kurki-Suonio, R. Laureijs, A. M. C. Le Brun, S. Ligori, P. B. Lilje, V. Lindholm, M. Magliocchetti, G. Mainetti, O. Mansutti, O. Marggraf, M. Martinelli, N Martinet, F. Marulli, R. J. Massey, E. Medinaceli, M. Melchior, M. Meneghetti, E. Merlin, G. Meylan, A. Mora, M. Moresco, C. Moretti, L Moscardini, C. Neissner, S. -M. Niemi, J. W. Nightingale, C Padilla, S. Paltani, F. Pasian, W. J. Percival, V. Pettorino, G. Polenta, M. Poncet, G. D. Racca, F. Raison, A. Renzi, G. Riccio, I. Risso, F. Rizzo, E. Romelli, M. Roncarelli, B. Rusholme, R. Saglia, Z. Sakr, A. G. Sánchez, D. Sapone, P. Schneider, T. Schrabback, A. Secroun, E. Sihvola, P. Simon, C. Sirignano, G. Sirri, J Skottfelt, L Stanco, P. Tallada-Crespí, A. J. Taylor, I. Tereno, S. Toft, R. Toledo-Moreo, F. Torradeflot, A. Tsyganov, I. Tutusaus, J. Valiviita, T. Vassallo, Y. Wang, J Weller, A. Zacchei, F. M. Zerbi, E. Zucca, M. Sereno
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106Institutions déclarées
20Pays d’affiliation déclarés
Rattachement africain : au, fr, gb, us, es, it, nl, de, in, ch, no, dk, fi, ca, lb, cl, at, pt, be, ro.
Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
The Euclid Quick Data Release Q2 provides an unprecedented deep, wide-field, high-angular-resolution view of the inner Galactic bulge through the Euclid Galactic Bulge Survey (EGBS). Nine contiguous fields covering 4.8 deg$^2$ were observed with the VIS instrument over 24 hours in March 2025. Unlike the nominal Euclid survey strategy, the EGBS employed 16 dithered exposures of 400 s each, corresponding to a total integration time of 1.8 hours per field. Dedicated calibration observations were obtained to derive point spread functions (PSFs). The primary objective of the EGBS is gravitational microlensing, with high-angular-resolution imaging enabling lens-mass measurements to better than 10%. The survey provides an optical reference dataset for previously discovered microlensing events and future observations of the Galactic bulge. The Q2 data were processed with the VIS-PF pipeline. The non-standard observing strategy required dedicated calibration products, while the extreme stellar density necessitated modifications to the astrometric calibration and cosmic-ray detection procedures. These improvements have since been incorporated into later pipeline versions. We describe the motivation, observing strategy, data processing, products, and first results of the EGBS. Astrometric residuals with respect to the Gaia DR3 catalogue are 5.5 mas in right ascension and 4.4 mas in declination across the survey area, while the photometric zero points are calibrated to 1.5%. The Q2 release includes calibrated single-dither images, dedicated PSF models, and photometric catalogues containing approximately 45 million detected sources per dither down to AB magnitude 26. Although incomplete because of extreme crowding, these products provide a robust astrometric and photometric foundation for future exploitation of the dataset.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
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Les institutions déclarées
University of TasmaniaInstitut d'Astrophysique de ParisCentre National de la Recherche ScientifiqueInstitut UTINAMSorbonne UniversitéUniversity of ManchesterLouisiana State UniversityEuropean Space Astronomy CentreUniversity of SalernoIstituto Nazionale di Fisica Nucleare, Sezione di NapoliUniversité Paris CitéCommissariat à l'Énergie Atomique et aux Énergies AlternativesUniversité Paris-SaclayAstrophysique, Instrumentation et ModélisationCEA Paris-SaclayOsservatorio Astronomico di PadovaLeiden UniversityUniversity of BonnJet Propulsion LaboratoryUniversité Bourgogne Franche-ComtéUniversity College LondonMax Planck Institute for AstronomyInstitute for Space Astrophysics and PlanetologyDepartment of SpaceBrera Astronomical ObservatoryOsservatorio di Astrofisica e Scienza dello SpazioScuola Internazionale Superiore di Studi AvanzatiUniversity of TriesteTrieste Astronomical ObservatoryIstituto Nazionale di Fisica Nucleare, Sezione di TriesteInstitute for Fundamental Physics of the UniverseIstituto Nazionale di Fisica Nucleare, Sezione di BolognaUniversity of BolognaMax Planck Institute for Extraterrestrial PhysicsLudwig-Maximilians-Universität MünchenAstronomical Observatory of CapodimonteIstituto Nazionale di Fisica Nucleare, Sezione di TorinoOsservatorio Astrofisico di TorinoUniversity of TurinNational Institute for AstrophysicsAstronomical Observatory of RomeIstituto Nazionale di Fisica Nucleare, Sezione di Roma IPort d'Informació CientíficaCentro de Investigaciones Energéticas, Medioambientales y TecnológicasInstituto de Astrofísica de CanariasRoyal ObservatoryUniversity of EdinburghEuropean Space Research InstituteLyon 1 UniversitéInstitut National de Physique Nucléaire et de Physique des ParticulesInstitut de Physique des 2 Infinis de LyonInstitució Catalana de Recerca i Estudis AvançatsInstitute of Space SciencesInstitut Català de Ciències del ClimaInstitut de Ciències del CosmosUniversity of GenevaInstitut d'Astrophysique SpatialeIstituto Nazionale di Fisica Nucleare, Sezione di PadovaAix-Marseille UniversitéCentre de physique des particules de MarseilleUniversity of BristolUniversity of OxfordTécnicas Reunidas (Spain)University of MilanIstituto Nazionale di Fisica Nucleare, Sezione di MilanoUniversity of OsloCalifornia Institute of TechnologyInfrared Processing and Analysis CenterLancaster UniversityDAWN Center for Independent LivingTechnical University of DenmarkGoddard Space Flight CenterUniversity of HelsinkiHelsinki Institute of PhysicsUniversity of GroningenLaboratoire Univers et ThéoriesCentre de Calcul de l’Institut National de Physique Nucléaire et de Physique des ParticulesDurham UniversityFHNW University of Applied Sciences and Arts Northwestern SwitzerlandÉcole Polytechnique Fédérale de LausanneEuropean Space AgencyInstitute for High Energy PhysicsEuropean Space Research and Technology CentreNewcastle UniversityUniversity of WaterlooPerimeter InstituteAgenzia Spaziale ItalianaCentre National d'Études SpatialesUniversity of PaduaIstituto Nazionale di Fisica Nucleare, Sezione di GenovaUniversity of GenoaConsejo Superior de Investigaciones CientíficasSaint Joseph UniversityInstitut de Recherche en Astrophysique et PlanétologieUniversidad Autónoma de MadridUniversity of ChileUniversität InnsbruckThe Open UniversityUniversity of LisbonInstitute of Astrophysics and Space SciencesUniversity of CopenhagenEuropean UnionUniversidad Politécnica de CartagenaInstitut d'Estudis Espacials de CatalunyaInstitute of Space Science - INFLPR SubsidiaryLMU Klinikum
Une affiliation ne permet pas de déduire la nationalité d’un auteur.
Les sujets associés
Stellar, planetary, and galactic studiesAstronomy and Astrophysical ResearchGalaxies: Formation, Evolution, Phenomena