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Euclid Quick Data Release (Q1) The Strong Lensing Discovery Engine B -- Early strong lens candidates from visual inspection of high velocity dispersion galaxies

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arxiv 2503.15325 v1 pith:TNP74FN2 submitted 2025-03-19 astro-ph.GA astro-ph.CO

Euclid Quick Data Release (Q1) The Strong Lensing Discovery Engine B -- Early strong lens candidates from visual inspection of high velocity dispersion galaxies

Euclid Collaboration: K. Rojas , T. E. Collett , J. A. Acevedo Barroso , J. W. Nightingale , D. Stern , L. A. Moustakas , S. Schuldt , G. Despali
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A. Melo M. Walmsley D. J. Ballard W. J. R. Enzi T. Li A. Sainz de Murieta I. T. Andika B. Cl\'ement F. Courbin L. R. Ecker R. Gavazzi N. Jackson A. Kov\'acs P. Matavulj M. Meneghetti S. Serjeant D. Sluse C. Tortora A. Verma L. Marchetti C. M. O'Riordan K. McCarthy S. H. Suyu R. B. Metcalf N. Aghanim B. Altieri A. Amara S. Andreon N. Auricchio H. Aussel C. Baccigalupi M. Baldi A. Balestra S. Bardelli P. Battaglia R. Bender A. Biviano A. Bonchi E. Branchini M. Brescia J. Brinchmann S. Camera G. Ca\~nas-Herrera V. Capobianco C. Carbone V. F. Cardone J. Carretero S. Casas M. Castellano G. Castignani S. Cavuoti K. C. Chambers A. Cimatti C. Colodro-Conde G. Congedo C. J. Conselice L. Conversi Y. Copin H. M. Courtois M. Cropper A. Da Silva H. Degaudenzi G. De Lucia A. M. Di Giorgio C. Dolding H. Dole F. Dubath X. Dupac S. Escoffier M. Fabricius M. Farina R. Farinelli F. Faustini S. Ferriol F. Finelli S. Fotopoulou M. Frailis E. Franceschi S. Galeotta K. George W. Gillard B. Gillis C. Giocoli P. G\'omez-Alvarez J. Gracia-Carpio B. R. Granett A. Grazian F. Grupp L. Guzzo S. Gwyn S. V. H. Haugan W. Holmes I. M. Hook F. Hormuth A. Hornstrup P. Hudelot K. Jahnke M. Jhabvala E. Keih\"anen S. Kermiche A. Kiessling B. Kubik K. Kuijken M. K\"ummel M. Kunz H. Kurki-Suonio Q. Le Boulc'h A. M. C. Le Brun D. Le Mignant P. Liebing S. Ligori P. B. Lilje V. Lindholm I. Lloro G. Mainetti D. Maino E. Maiorano O. Mansutti S. Marcin O. Marggraf M. Martinelli N. Martinet F. Marulli R. Massey S. Maurogordato H. J. McCracken E. Medinaceli S. Mei M. Melchior Y. Mellier E. Merlin G. Meylan A. Mora M. Moresco L. Moscardini R. Nakajima C. Neissner R. C. Nichol S.-M. Niemi C. Padilla S. Paltani F. Pasian K. Pedersen W. J. Percival V. Pettorino S. Pires G. Polenta M. Poncet L. A. Popa L. Pozzetti F. Raison R. Rebolo A. Renzi J. Rhodes G. Riccio E. Romelli M. Roncarelli R. Saglia Z. Sakr A. G. S\'anchez D. Sapone B. Sartoris J. A. Schewtschenko M. Schirmer P. Schneider T. Schrabback A. Secroun G. Seidel M. Seiffert S. Serrano P. Simon C. Sirignano G. Sirri L. Stanco J. Steinwagner P. Tallada-Cresp\'i A. N. Taylor I. Tereno S. Toft R. Toledo-Moreo F. Torradeflot I. Tutusaus L. Valenziano J. Valiviita T. Vassallo G. Verdoes Kleijn A. Veropalumbo Y. Wang J. Weller A. Zacchei G. Zamorani F. M. Zerbi E. Zucca M. Ballardini M. Bolzonella E. Bozzo C. Burigana R. Cabanac A. Cappi D. Di Ferdinando J. A. Escartin Vigo L. Gabarra J. Mart\'in-Fleitas S. Matthew N. Mauri A. Pezzotta M. P\"ontinen C. Porciani I. Risso V. Scottez M. Sereno M. Tenti M. Viel M. Wiesmann Y. Akrami S. Alvi S. Anselmi M. Archidiacono F. Atrio-Barandela C. Benoist K. Benson P. Bergamini D. Bertacca M. Bethermin A. Blanchard L. Blot M. L. Brown S. Bruton A. Calabro B. Camacho Quevedo F. Caro C. S. Carvalho T. Castro F. Cogato A. R. Cooray O. Cucciati S. Davini F. De Paolis G. Desprez A. D\'iaz-S\'anchez J. J. Diaz S. Di Domizio J. M. Diego P.-A. Duc A. Enia Y. Fang A. G. Ferrari P. G. Ferreira A. Finoguenov A. Fontana A. Franco K. Ganga J. Garc\'ia-Bellido T. Gasparetto V. Gautard E. Gaztanaga F. Giacomini F. Gianotti G. Gozaliasl M. Guidi C. M. Gutierrez A. Hall W. G. Hartley C. Hern\'andez-Monteagudo H. Hildebrandt J. Hjorth J. J. E. Kajava Y. Kang V. Kansal D. Karagiannis K. Kiiveri C. C. Kirkpatrick S. Kruk J. Le Graet L. Legrand M. Lembo F. Lepori G. Leroy G. F. Lesci J. Lesgourgues L. Leuzzi T. I. Liaudat A. Loureiro J. Macias-Perez G. Maggio M. Magliocchetti E. A. Magnier F. Mannucci R. Maoli C. J. A. P. Martins L. Maurin M. Miluzio P. Monaco C. Moretti G. Morgante S. Nadathur K. Naidoo A. Navarro-Alsina S. Nesseris F. Passalacqua K. Paterson L. Patrizii A. Pisani D. Potter S. Quai M. Radovich P.-F. Rocci S. Sacquegna M. Sahl\'en D. B. Sanders E. Sarpa C. Scarlata A. Schneider D. Sciotti E. Sellentin L. C. Smith K. Tanidis G. Testera R. Teyssier A. Troja M. Tucci C. Valieri A. Venhola D. Vergani G. Vernardos G. Verza P. Vielzeuf N. A. Walton J. Wilde D. Scott
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classification astro-ph.GA astro-ph.CO
keywords euclidcandidateslenslensesstronggradeconfirmeddesi
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We present a search for strong gravitational lenses in Euclid imaging with high stellar velocity dispersion ($\sigma_\nu > 180$ km/s) 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, consistent with an expected sample of $\sim$32. Palomar spectroscopy confirmed 5 lens systems, while DESI spectra confirmed one, provided ambiguous results for another, and help to discard one. The \Euclid automated lens modeler modelled 53 candidates, confirming 38 as lenses, failing to model 9, and ruling out 6 grade B candidates. For the remaining 25 candidates we could not gather additional information. More importantly, our expert-classified non-lenses provide an excellent training set for machine learning lens classifiers. We create high-fidelity simulations of \Euclid lenses by painting realistic lensed sources behind the expert tagged (non-lens) luminous red galaxies. This training set is the foundation stone for the \Euclid galaxy-galaxy strong lensing discovery engine.

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