Euclid: The Early Release Observations Lens Search Experiment
J. A. Acevedo Barroso (1), C. M. O'Riordan (2), B. Cl\'ement (1 and, 3), C. Tortora (4), T. E. Collett (5), F. Courbin (1, 6, 7), R. Gavazzi, (8, 9), R. B. Metcalf (10, 11), V. Busillo (4, 12, 13), I. T., Andika (14, 2), R. Cabanac (15), H. M. Courtois (16), J. Crook-Mansour

TL;DR
This study assesses Euclid's capability to detect galaxy-scale gravitational lenses through visual inspection of early data, modeling candidates, and extrapolating to the full survey, predicting around 100,000 lenses.
Contribution
First systematic visual search and modeling of Euclid early data for galaxy lenses, providing estimates for the full survey and comparing with theoretical predictions.
Findings
Identified 16 lens candidates in early data, 5 validated by modeling.
Estimated ~100,000 lenses in the full Euclid survey, consistent with forecasts.
Detected Einstein radii mostly on the higher side compared to models.
Abstract
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 Euclid Early Release Observations data towards the Perseus cluster using both the high-resolution band and the lower-resolution , , bands. Each extended source brighter than magnitude 23 in was inspected by 41 expert human classifiers. This amounts to stamps of . We found grade A and grade B candidates. We assessed the validity of these 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…
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