Overview
- Deep JWST NIRCam imaging totaling 255 hours of the COSMOS field enabled weak-lensing analysis of roughly 800,000 background galaxies.
- The reconstruction reaches about one-arcminute resolution, roughly twice as sharp as previous Hubble-based dark-matter maps.
- Previously unresolved features emerge, including fine filaments, small halos, and bridges that trace the cosmic web.
- The inferred mass distribution closely aligns with luminous matter, reinforcing expectations from the standard cosmological model.
- Coverage spans only a small sky patch of roughly 2.5 full-moon areas, with broader mapping anticipated from ESA’s Euclid and NASA’s Nancy Grace Roman missions.