An ultra-high-resolution map of (dark) matter
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Scognamiglio, Diana Leroy, Gavin Harvey, David Massey, Richard Rhodes, Jason Akins, Hollis B. Brinch, Malte Berman, Edward Casey, Caitlin M. Drakos, Nicole E. Faisst, Andreas L. Franco, Maximilien Fung, Leo W. H. Gozaliasl, Ghassem He, Qiuhan Hatamnia, Hossein Huff, Eric Hogg, Natalie B. Ilbert, Olivier Kartaltepe, Jeyhan S. Koekemoer, Anton M. Jin, Shouwen Lambrides, Erini Leauthaud, Alexie Lentz, Zane D. Liu, Daizhong Mahler, Guillaume Maraston, Claudia Martin, Crystal L. McCleary, Jacqueline Nightingale, James Mobasher, Bahram Paquereau, Louise Pires, Sandrine Robertson, Brant E. Sanders, David B. Scarlata, Claudia Shuntov, Marko Toni, Greta von Wietersheim-Kramsta, Maximilian Weaver, John R. |
| author_facet | Scognamiglio, Diana Leroy, Gavin Harvey, David Massey, Richard Rhodes, Jason Akins, Hollis B. Brinch, Malte Berman, Edward Casey, Caitlin M. Drakos, Nicole E. Faisst, Andreas L. Franco, Maximilien Fung, Leo W. H. Gozaliasl, Ghassem He, Qiuhan Hatamnia, Hossein Huff, Eric Hogg, Natalie B. Ilbert, Olivier Kartaltepe, Jeyhan S. Koekemoer, Anton M. Jin, Shouwen Lambrides, Erini Leauthaud, Alexie Lentz, Zane D. Liu, Daizhong Mahler, Guillaume Maraston, Claudia Martin, Crystal L. McCleary, Jacqueline Nightingale, James Mobasher, Bahram Paquereau, Louise Pires, Sandrine Robertson, Brant E. Sanders, David B. Scarlata, Claudia Shuntov, Marko Toni, Greta von Wietersheim-Kramsta, Maximilian Weaver, John R. |
| contents | Ordinary matter-including particles such as protons and neutrons-accounts for only about one sixth of all matter in the Universe. The rest is dark matter, which does not emit or absorb light but plays a fundamental role in galaxy and structure evolution. Because it interacts only through gravity, one of the most direct probes is weak gravitational lensing: the deflection of light from distant galaxies by intervening mass. Here we present an extremely detailed, wide-area weak-lensing mass map, covering 0.77 deg x 0.70 deg, using high-resolution imaging from the James Webb Space Telescope (JWST) as part of the COSMOS-Web survey. By measuring the shapes of 129 galaxies per square arcminute-many independently in the F115W and F150W bands-we achieve an angular resolution of 1.00 +/- 0.01 arcmin. Our map has more than twice the resolution of earlier Hubble Space Telescope maps, revealing how dark and luminous matter co-evolve across filaments, clusters, and under-densities. It traces mass features out to z ~ 2, including the most distant structure at z ~ 1.1. The sensitivity to high-redshift lensing constrains galaxy environments at the peak of cosmic star formation and sets a high-resolution benchmark for testing theories about the nature of dark matter and the formation of large-scale cosmic structure |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_17239 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | An ultra-high-resolution map of (dark) matter Scognamiglio, Diana Leroy, Gavin Harvey, David Massey, Richard Rhodes, Jason Akins, Hollis B. Brinch, Malte Berman, Edward Casey, Caitlin M. Drakos, Nicole E. Faisst, Andreas L. Franco, Maximilien Fung, Leo W. H. Gozaliasl, Ghassem He, Qiuhan Hatamnia, Hossein Huff, Eric Hogg, Natalie B. Ilbert, Olivier Kartaltepe, Jeyhan S. Koekemoer, Anton M. Jin, Shouwen Lambrides, Erini Leauthaud, Alexie Lentz, Zane D. Liu, Daizhong Mahler, Guillaume Maraston, Claudia Martin, Crystal L. McCleary, Jacqueline Nightingale, James Mobasher, Bahram Paquereau, Louise Pires, Sandrine Robertson, Brant E. Sanders, David B. Scarlata, Claudia Shuntov, Marko Toni, Greta von Wietersheim-Kramsta, Maximilian Weaver, John R. Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Ordinary matter-including particles such as protons and neutrons-accounts for only about one sixth of all matter in the Universe. The rest is dark matter, which does not emit or absorb light but plays a fundamental role in galaxy and structure evolution. Because it interacts only through gravity, one of the most direct probes is weak gravitational lensing: the deflection of light from distant galaxies by intervening mass. Here we present an extremely detailed, wide-area weak-lensing mass map, covering 0.77 deg x 0.70 deg, using high-resolution imaging from the James Webb Space Telescope (JWST) as part of the COSMOS-Web survey. By measuring the shapes of 129 galaxies per square arcminute-many independently in the F115W and F150W bands-we achieve an angular resolution of 1.00 +/- 0.01 arcmin. Our map has more than twice the resolution of earlier Hubble Space Telescope maps, revealing how dark and luminous matter co-evolve across filaments, clusters, and under-densities. It traces mass features out to z ~ 2, including the most distant structure at z ~ 1.1. The sensitivity to high-redshift lensing constrains galaxy environments at the peak of cosmic star formation and sets a high-resolution benchmark for testing theories about the nature of dark matter and the formation of large-scale cosmic structure |
| title | An ultra-high-resolution map of (dark) matter |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.17239 |