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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Euclid: The Early Release Observations Lens Search Experiment
AU - Euclid Collaboration
AU - Acevedo Barroso, J.A.
AU - O’Riordan, C.M.
AU - Clément, B.
AU - Tortora, C.
AU - Collett, T.E.
AU - Courbin, F.
AU - Gavazzi, R.
AU - Metcalf, R.B.
AU - Busillo, V.
AU - Andika, I.T.
AU - Cabanac, R.
AU - Courtois, H.M.
AU - Crook-Mansour, J.
AU - Delchambre, L.
AU - Despali, G.
AU - Ecker, L.R.
AU - Franco, A.
AU - Holloway, P.
AU - Jackson, N.
AU - Jahnke, K.
AU - Mahler, G.
AU - Marchetti, L.
AU - Matavulj, P.
AU - Melo, A.
AU - Meneghetti, M.
AU - Moustakas, L.A.
AU - Müller, O.
AU - Nucita, A.A.
AU - Paulino-Afonso, A.
AU - Pearson, J.
AU - Rojas, K.
AU - Scarlata, C.
AU - Schuldt, S.
AU - Serjeant, S.
AU - Sluse, D.
AU - Suyu, S.H.
AU - Vaccari, M.
AU - Verma, A.
AU - Vernardos, G.
AU - Walmsley, M.
AU - Bouy, H.
AU - Walth, G.L.
AU - Powell, D.M.
AU - Bolzonella, M.
AU - Stone, C.
AU - Hook, I.
AU - Taylor, A.N.
AU - Wang, Y.
AU - Weller, J.
AU - Scott, D.
PY - 2025/5/31
Y1 - 2025/5/31
N2 - We investigated the ability of the Euclid telescope to detect galaxy-scale gravitational lenses. To do so, we performed a systematic visual inspection of the 0.7 deg2 Euclid Early Release Observations data towards the Perseus cluster using both the high-resolution IE band and the lower-resolution YE , JE, and HE bands. Each extended source brighter than magnitude 23 in IE was inspected by 41 expert humanclassifiers. This amounts to 12086 stamps of 10″ × 10″. We found 3 grade A and 13 grade B candidates. We assessed the validity of these 16 candidates by modelling them and checking that they are consistent with a single source lensed by a plausible mass distribution. Five of the candidates pass this check, five others are rejected by the modelling, and six are inconclusive. Extrapolating from the five successfully modelled candidates, we infer that the full 14 000 deg2 of the Euclid Wide Survey should contain 100 000−30 000+ 70 000 galaxy-galaxy lenses that are both discoverable through visual inspection and have valid lens models. This is consistent with theoretical forecasts of 170 000 discoverable galaxy-galaxy lenses in Euclid. Our five modelled lenses have Einstein radii in the range 0'.'68 < θE < 1″.24, but their Einstein radius distribution is on the higher side when compared to theoretical forecasts. This suggests that our methodology is likely missing small-Einstein-radius systems. Whilst it is implausible to visually inspect the full Euclid dataset, our results corroborate the promise that Euclid will ultimately deliver a sample of around 105 galaxy-scale lenses.
AB - We investigated the ability of the Euclid telescope to detect galaxy-scale gravitational lenses. To do so, we performed a systematic visual inspection of the 0.7 deg2 Euclid Early Release Observations data towards the Perseus cluster using both the high-resolution IE band and the lower-resolution YE , JE, and HE bands. Each extended source brighter than magnitude 23 in IE was inspected by 41 expert humanclassifiers. This amounts to 12086 stamps of 10″ × 10″. We found 3 grade A and 13 grade B candidates. We assessed the validity of these 16 candidates by modelling them and checking that they are consistent with a single source lensed by a plausible mass distribution. Five of the candidates pass this check, five others are rejected by the modelling, and six are inconclusive. Extrapolating from the five successfully modelled candidates, we infer that the full 14 000 deg2 of the Euclid Wide Survey should contain 100 000−30 000+ 70 000 galaxy-galaxy lenses that are both discoverable through visual inspection and have valid lens models. This is consistent with theoretical forecasts of 170 000 discoverable galaxy-galaxy lenses in Euclid. Our five modelled lenses have Einstein radii in the range 0'.'68 < θE < 1″.24, but their Einstein radius distribution is on the higher side when compared to theoretical forecasts. This suggests that our methodology is likely missing small-Einstein-radius systems. Whilst it is implausible to visually inspect the full Euclid dataset, our results corroborate the promise that Euclid will ultimately deliver a sample of around 105 galaxy-scale lenses.
U2 - 10.1051/0004-6361/202451868
DO - 10.1051/0004-6361/202451868
M3 - Journal article
VL - 697
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 1432-0746
M1 - A14
ER -