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The ASTRO 3D Galaxy Evolution with Lenses (AGEL) survey studies strong gravitational lenses identified using Machine Learning methods in deep optical imaging from the Dark Energy Survey and DECaLS. The lenses are at higher redshifts relative to existing surveys due to the combination of deeper depth and higher resolution imaging from DECam. AGEL will spectroscopically confirm about 200 bright (r<22 mag) strong gravitational lenses to enable statistically robust studies of deflectors and magnified sources.
Our first catalogue of redshifts was published in Tran et al. 2022 and included 77 lens systems. Barone et al. 2025 builds on this first release and includes redshifts for 139 systems as well as reduced Hubble/WFC3 images for 71 lenses. See the The AGEL Data tab for details.
"Most Strong Lensing Deflectors in the AGEL Survey are in Group and Cluster Environments"
Gottemoller, Sahu, Cordova-Rosado, Iwamoto et al.
Astronomical Journal, 2026
The AGEL dataset relies on observations from facilities around the world including:
Webb Space Telescope
Hubble Space Telescope
Keck Observatory
ESO VLT
Magellan Telescopes
RESOURCES
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Made by Haven McIntosh-Lombardo
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Compound lens map
K-correction for a 50,000K blackbody
External Resources
Short explanation video (STScI)
Gravitational lensing simulator
Stone et al., (2024). Caustics: A Python Package for Accelerated Strong Gravitational Lensing Simulations. Journal of Open Source Software, 9(103), 7081, https://doi.org/10.21105/joss.07081
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