The COSMOS-Web Lens Survey (COWLS) I: Discovery of >100 high redshift strong lenses in contiguous JWST imaging
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| Format: | Preprint |
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2025
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| author | Nightingale, James Mahler, Guillaume McCleary, Jacqueline He, Qiuhan Hogg, Natalie B. Amvrosiadis, Aristeidis Gozaliasl, Ghassem Mercier, Wilfried Scognamiglio, Diana Berman, Edward Leroy, Gavin Liu, Daizhong Massey, Richard J. Shuntov, Marko von Wietersheim-Kramsta, Maximilian Franco, Maximilien Paquereau, Louise Ilbert, Olivier Allen, Natalie Toft, Sune Akins, Hollis B. Casey, Caitlin M. Kartaltepe, Jeyhan S. Koekemoer, Anton M. McCracken, Henry Joy Rhodes, Jason D. Robertson, Brant E. Drakos, Nicole E. Faisst, Andreas L. Jin, Shuowen |
| author_facet | Nightingale, James Mahler, Guillaume McCleary, Jacqueline He, Qiuhan Hogg, Natalie B. Amvrosiadis, Aristeidis Gozaliasl, Ghassem Mercier, Wilfried Scognamiglio, Diana Berman, Edward Leroy, Gavin Liu, Daizhong Massey, Richard J. Shuntov, Marko von Wietersheim-Kramsta, Maximilian Franco, Maximilien Paquereau, Louise Ilbert, Olivier Allen, Natalie Toft, Sune Akins, Hollis B. Casey, Caitlin M. Kartaltepe, Jeyhan S. Koekemoer, Anton M. McCracken, Henry Joy Rhodes, Jason D. Robertson, Brant E. Drakos, Nicole E. Faisst, Andreas L. Jin, Shuowen |
| contents | We present the COSMOS-Web Lens Survey (COWLS), a sample of over 100 strong lens candidates from the $0.54$\,deg$^2$ COSMOS-Web survey, discovered using exquisite James Webb Space Telescope (JWST) imaging across four wavebands. Following two rounds of visual inspection, over 100 candidates were ranked as `high confidence' or `likely' by at least $50\%$ of inspectors. The COWLS sample has several notable properties: (i) magnified source galaxies spanning redshifts $z \sim 0.1$ to $z \sim 9$, which therefore extend into the epoch of reionisation; (ii) the highest-redshift lens galaxies known, pushing galaxy density profile evolution studies beyond $z \sim 2$; (iii) all lenses are distributed within a contiguous $0.54$\,deg$^2$ region, allowing for joint strong and weak lensing analyses; and (iv) a subset exhibits lensed source emission ray-traced near the lens galaxy centers, enabling studies of supermassive black holes and dust absorption. A key innovation of our approach is the use of lens modelling to aid in identifying lenses that may otherwise be missed. This paper is accompanied by the first COWLS public release, providing JWST NIRCam imaging in four bands, lens models, pixelized source reconstructions and lens redshift estimates : https://github.com/Jammy2211/COWLS_COSMOS_Web_Lens_Survey |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_08777 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The COSMOS-Web Lens Survey (COWLS) I: Discovery of >100 high redshift strong lenses in contiguous JWST imaging Nightingale, James Mahler, Guillaume McCleary, Jacqueline He, Qiuhan Hogg, Natalie B. Amvrosiadis, Aristeidis Gozaliasl, Ghassem Mercier, Wilfried Scognamiglio, Diana Berman, Edward Leroy, Gavin Liu, Daizhong Massey, Richard J. Shuntov, Marko von Wietersheim-Kramsta, Maximilian Franco, Maximilien Paquereau, Louise Ilbert, Olivier Allen, Natalie Toft, Sune Akins, Hollis B. Casey, Caitlin M. Kartaltepe, Jeyhan S. Koekemoer, Anton M. McCracken, Henry Joy Rhodes, Jason D. Robertson, Brant E. Drakos, Nicole E. Faisst, Andreas L. Jin, Shuowen Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present the COSMOS-Web Lens Survey (COWLS), a sample of over 100 strong lens candidates from the $0.54$\,deg$^2$ COSMOS-Web survey, discovered using exquisite James Webb Space Telescope (JWST) imaging across four wavebands. Following two rounds of visual inspection, over 100 candidates were ranked as `high confidence' or `likely' by at least $50\%$ of inspectors. The COWLS sample has several notable properties: (i) magnified source galaxies spanning redshifts $z \sim 0.1$ to $z \sim 9$, which therefore extend into the epoch of reionisation; (ii) the highest-redshift lens galaxies known, pushing galaxy density profile evolution studies beyond $z \sim 2$; (iii) all lenses are distributed within a contiguous $0.54$\,deg$^2$ region, allowing for joint strong and weak lensing analyses; and (iv) a subset exhibits lensed source emission ray-traced near the lens galaxy centers, enabling studies of supermassive black holes and dust absorption. A key innovation of our approach is the use of lens modelling to aid in identifying lenses that may otherwise be missed. This paper is accompanied by the first COWLS public release, providing JWST NIRCam imaging in four bands, lens models, pixelized source reconstructions and lens redshift estimates : https://github.com/Jammy2211/COWLS_COSMOS_Web_Lens_Survey |
| title | The COSMOS-Web Lens Survey (COWLS) I: Discovery of >100 high redshift strong lenses in contiguous JWST imaging |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.08777 |