Euclid Quick Data Release (Q1): XXVI. The Strong Lensing Discovery Engine A – System overview and first lens sample★

Euclid Collaboration

doi:10.1051/0004-6361/202555141

Euclid Quick Data Release (Q1): XXVI. The Strong Lensing Discovery Engine A – System overview and first lens sample★

Euclid Collaboration

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We present a catalogue of 497 galaxy-galaxy strong lenses in the Euclid Quick Release 1 data (63 deg²). In the initial 0.45% of Euclid’s surveys, we double the total number of known lens candidates with space-based imaging. Our catalogue includes 250 grade A candidates, the vast majority of which (243) were previously unpublished. Euclid’s resolution reveals rare lens configurations of scientific value, including double-source-plane lenses, edge-on lenses, complete Einstein rings, and quadruply imaged lenses. We resolve lenses with small Einstein radii (θ_E < 1″) in large numbers for the first time. These lenses were found through an initial sweep by deep learning models followed by Space Warps citizen scientist inspection, expert vetting, and system-by-system modelling. Our search approach scales straightforwardly to Euclid Data Release 1 and, without changes, would yield approximately 7000 high-confidence (grade A or B) lens candidates by late 2026. Further extrapolating to the complete Euclid Wide Survey implies a likely yield of over 100 000 high-confidence candidates, transforming strong lensing science.

Original language	English (US)
Article number	A26
Journal	Astronomy and Astrophysics
Volume	711
DOIs	https://doi.org/10.1051/0004-6361/202555141
State	Published - Jul 2026

Bibliographical note

Publisher Copyright:
© The Authors 2026. Open Access article, https://www.edpsciences.org, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.This article is published in open access under the https://www.aanda.org/subscribe-to-open-faqs. mailto:[email protected] to support open access publication.

Keywords

catalogs
gravitational lensing: strong
methods: statistical

Publisher link

10.1051/0004-6361/202555141

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@article{a764087ef1674b6e9729a3b8690e8510,

title = "Euclid Quick Data Release (Q1): XXVI. The Strong Lensing Discovery Engine A {\textendash} System overview and first lens sample★",

abstract = "We present a catalogue of 497 galaxy-galaxy strong lenses in the Euclid Quick Release 1 data (63 deg2). In the initial 0.45\% of Euclid{\textquoteright}s surveys, we double the total number of known lens candidates with space-based imaging. Our catalogue includes 250 grade A candidates, the vast majority of which (243) were previously unpublished. Euclid{\textquoteright}s resolution reveals rare lens configurations of scientific value, including double-source-plane lenses, edge-on lenses, complete Einstein rings, and quadruply imaged lenses. We resolve lenses with small Einstein radii (θE < 1″) in large numbers for the first time. These lenses were found through an initial sweep by deep learning models followed by Space Warps citizen scientist inspection, expert vetting, and system-by-system modelling. Our search approach scales straightforwardly to Euclid Data Release 1 and, without changes, would yield approximately 7000 high-confidence (grade A or B) lens candidates by late 2026. Further extrapolating to the complete Euclid Wide Survey implies a likely yield of over 100 000 high-confidence candidates, transforming strong lensing science.",

keywords = "catalogs, gravitational lensing: strong, methods: statistical",

author = "\{Euclid Collaboration\} and M. Walmsley and P. Holloway and Lines, \{N. E.P.\} and K. Rojas and Collett, \{T. E.\} and A. Verma and T. Li and Nightingale, \{J. W.\} and G. Despali and S. Schuldt and R. Gavazzi and A. Melo and Metcalf, \{R. B.\} and Andika, \{I. T.\} and L. Leuzzi and A. Manj{\'o}n-Garc{\'i}a and R. Pearce-Casey and Vincken, \{S. H.\} and J. Wilde and V. Busillo and C. Tortora and \{Acevedo Barroso\}, \{J. A.\} and H. Dole and Ecker, \{L. R.\} and J. Pearson and Marshall, \{P. J.\} and A. More and T. Saifollahi and J. Gracia-Carpio and E. Baeten and C. Cornen and Johnson, \{L. C.\} and C. Macmillan and S. Kruk and Remmelgas, \{K. A.\} and B. Cl{\'e}ment and H. Degaudenzi and F. Courbin and J. Bovy and S. Casas and H. Dannerbauer and Diego, \{J. M.\} and K. Finner and A. Galan and C. Giocoli and Hogg, \{N. B.\} and K. Jahnke and J. Katona and S. Bruton and C. Scarlata",

note = "Publisher Copyright: {\textcopyright} The Authors 2026. Open Access article, https://www.edpsciences.org, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.This article is published in open access under the https://www.aanda.org/subscribe-to-open-faqs. mailto:[email protected] to support open access publication.",

year = "2026",

month = jul,

doi = "10.1051/0004-6361/202555141",

language = "English (US)",

volume = "711",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - Euclid Quick Data Release (Q1)

T2 - XXVI. The Strong Lensing Discovery Engine A – System overview and first lens sample★

AU - Euclid Collaboration

AU - Walmsley, M.

AU - Holloway, P.

AU - Lines, N. E.P.

AU - Rojas, K.

AU - Collett, T. E.

AU - Verma, A.

AU - Li, T.

AU - Nightingale, J. W.

AU - Despali, G.

AU - Schuldt, S.

AU - Gavazzi, R.

AU - Melo, A.

AU - Metcalf, R. B.

AU - Andika, I. T.

AU - Leuzzi, L.

AU - Manjón-García, A.

AU - Pearce-Casey, R.

AU - Vincken, S. H.

AU - Wilde, J.

AU - Busillo, V.

AU - Tortora, C.

AU - Acevedo Barroso, J. A.

AU - Dole, H.

AU - Ecker, L. R.

AU - Pearson, J.

AU - Marshall, P. J.

AU - More, A.

AU - Saifollahi, T.

AU - Gracia-Carpio, J.

AU - Baeten, E.

AU - Cornen, C.

AU - Johnson, L. C.

AU - Macmillan, C.

AU - Kruk, S.

AU - Remmelgas, K. A.

AU - Clément, B.

AU - Degaudenzi, H.

AU - Courbin, F.

AU - Bovy, J.

AU - Casas, S.

AU - Dannerbauer, H.

AU - Diego, J. M.

AU - Finner, K.

AU - Galan, A.

AU - Giocoli, C.

AU - Hogg, N. B.

AU - Jahnke, K.

AU - Katona, J.

AU - Bruton, S.

AU - Scarlata, C.

N1 - Publisher Copyright: © The Authors 2026. Open Access article, https://www.edpsciences.org, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.This article is published in open access under the https://www.aanda.org/subscribe-to-open-faqs. mailto:[email protected] to support open access publication.

PY - 2026/7

Y1 - 2026/7

N2 - We present a catalogue of 497 galaxy-galaxy strong lenses in the Euclid Quick Release 1 data (63 deg2). In the initial 0.45% of Euclid’s surveys, we double the total number of known lens candidates with space-based imaging. Our catalogue includes 250 grade A candidates, the vast majority of which (243) were previously unpublished. Euclid’s resolution reveals rare lens configurations of scientific value, including double-source-plane lenses, edge-on lenses, complete Einstein rings, and quadruply imaged lenses. We resolve lenses with small Einstein radii (θE < 1″) in large numbers for the first time. These lenses were found through an initial sweep by deep learning models followed by Space Warps citizen scientist inspection, expert vetting, and system-by-system modelling. Our search approach scales straightforwardly to Euclid Data Release 1 and, without changes, would yield approximately 7000 high-confidence (grade A or B) lens candidates by late 2026. Further extrapolating to the complete Euclid Wide Survey implies a likely yield of over 100 000 high-confidence candidates, transforming strong lensing science.

AB - We present a catalogue of 497 galaxy-galaxy strong lenses in the Euclid Quick Release 1 data (63 deg2). In the initial 0.45% of Euclid’s surveys, we double the total number of known lens candidates with space-based imaging. Our catalogue includes 250 grade A candidates, the vast majority of which (243) were previously unpublished. Euclid’s resolution reveals rare lens configurations of scientific value, including double-source-plane lenses, edge-on lenses, complete Einstein rings, and quadruply imaged lenses. We resolve lenses with small Einstein radii (θE < 1″) in large numbers for the first time. These lenses were found through an initial sweep by deep learning models followed by Space Warps citizen scientist inspection, expert vetting, and system-by-system modelling. Our search approach scales straightforwardly to Euclid Data Release 1 and, without changes, would yield approximately 7000 high-confidence (grade A or B) lens candidates by late 2026. Further extrapolating to the complete Euclid Wide Survey implies a likely yield of over 100 000 high-confidence candidates, transforming strong lensing science.

KW - catalogs

KW - gravitational lensing: strong

KW - methods: statistical

UR - https://www.scopus.com/pages/publications/105043538585

UR - https://www.scopus.com/pages/publications/105043538585#tab=citedBy

U2 - 10.1051/0004-6361/202555141

DO - 10.1051/0004-6361/202555141

M3 - Article

AN - SCOPUS:105043538585

SN - 0004-6361

VL - 711

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A26

ER -

Euclid Quick Data Release (Q1): XXVI. The Strong Lensing Discovery Engine A – System overview and first lens sample★

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