The Carousel Lens I: A Spectroscopic Survey of the Carousel Lens Field
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911403493818368 |
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| author | O'Donnell, Jackson H. Williams, Demetrius Y. Jeltema, Tesla E. Sheu, William Urcelay, Felipe Huang, Xiaosheng Jones, Tucker Glazebrook, Karl Barone, Tania M. Cikota, Aleksandar Bian, Fuyan Storfer, Christopher J. Ballard, Daniel J. Caminha, Gabriel Kacprzak, Glenn G. Nanayakkara, Themiya Sahu, Nandini Skobe, Hannah Shajib, Anowar J. Suyu, Sherry Tran, Kim-Vy C., Keerthi Vasan G. |
| author_facet | O'Donnell, Jackson H. Williams, Demetrius Y. Jeltema, Tesla E. Sheu, William Urcelay, Felipe Huang, Xiaosheng Jones, Tucker Glazebrook, Karl Barone, Tania M. Cikota, Aleksandar Bian, Fuyan Storfer, Christopher J. Ballard, Daniel J. Caminha, Gabriel Kacprzak, Glenn G. Nanayakkara, Themiya Sahu, Nandini Skobe, Hannah Shajib, Anowar J. Suyu, Sherry Tran, Kim-Vy C., Keerthi Vasan G. |
| contents | We present a spectroscopic survey of field galaxies and lensed sources in the vicinity of the strong lensing galaxy cluster known as the Carousel lens at z=0.49. Using both Gemini/GMOS slitmask spectra and deep VLT/MUSE observations, we bring the total number of lensed sources up to 13, including three which were not previously known from imaging observations but are apparent in the MUSE data as emission-line sources. Of these sources, 10 have confident redshifts, and an additional 2 have tentative redshifts from likely Ly$α$ emission (including seven new redshifts determined here adding to those presented previously in Sheu et al. (2024)). The lensed sources span a redshift range from z=0.96 to 4.09 with most of them showing 3-5 images, including four sources displaying central or radial images. In total, we identify 43 images of these 13 sources. This lens system is remarkably symmetric and well-modeled by a simpler lens model than typical cluster lenses, and the large number of sources and their large range of redshifts make this cluster ideal for constraining cosmological parameters such as $w$ and $Ω_m$ as well as the cluster density profile. Additionally, we present a catalog of 57 unlensed field galaxies with confident redshifts, of which 49 are associated with the cluster. We measure a cluster velocity dispersion of about 1100 km s$^{-1}$ from which we estimate a halo mass $M_{200c} \approx 1.2 \times 10^{15} M_\odot$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_14422 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Carousel Lens I: A Spectroscopic Survey of the Carousel Lens Field O'Donnell, Jackson H. Williams, Demetrius Y. Jeltema, Tesla E. Sheu, William Urcelay, Felipe Huang, Xiaosheng Jones, Tucker Glazebrook, Karl Barone, Tania M. Cikota, Aleksandar Bian, Fuyan Storfer, Christopher J. Ballard, Daniel J. Caminha, Gabriel Kacprzak, Glenn G. Nanayakkara, Themiya Sahu, Nandini Skobe, Hannah Shajib, Anowar J. Suyu, Sherry Tran, Kim-Vy C., Keerthi Vasan G. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present a spectroscopic survey of field galaxies and lensed sources in the vicinity of the strong lensing galaxy cluster known as the Carousel lens at z=0.49. Using both Gemini/GMOS slitmask spectra and deep VLT/MUSE observations, we bring the total number of lensed sources up to 13, including three which were not previously known from imaging observations but are apparent in the MUSE data as emission-line sources. Of these sources, 10 have confident redshifts, and an additional 2 have tentative redshifts from likely Ly$α$ emission (including seven new redshifts determined here adding to those presented previously in Sheu et al. (2024)). The lensed sources span a redshift range from z=0.96 to 4.09 with most of them showing 3-5 images, including four sources displaying central or radial images. In total, we identify 43 images of these 13 sources. This lens system is remarkably symmetric and well-modeled by a simpler lens model than typical cluster lenses, and the large number of sources and their large range of redshifts make this cluster ideal for constraining cosmological parameters such as $w$ and $Ω_m$ as well as the cluster density profile. Additionally, we present a catalog of 57 unlensed field galaxies with confident redshifts, of which 49 are associated with the cluster. We measure a cluster velocity dispersion of about 1100 km s$^{-1}$ from which we estimate a halo mass $M_{200c} \approx 1.2 \times 10^{15} M_\odot$. |
| title | The Carousel Lens I: A Spectroscopic Survey of the Carousel Lens Field |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2601.14422 |