Unveiling a Thin Filament of the Cosmic Web in the Ursa Major Supergroup
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866911393467334656 |
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| author | Xu, Jin-Long Zhu, Ming Jiang, Peng Yu, Nai-Ping Zhang, Chuan-Peng Liu, Xiao-Lan Ai, Mei Jing, Yin-Jie Wang, Jie |
| author_facet | Xu, Jin-Long Zhu, Ming Jiang, Peng Yu, Nai-Ping Zhang, Chuan-Peng Liu, Xiao-Lan Ai, Mei Jing, Yin-Jie Wang, Jie |
| contents | Filaments are crucial components of the cosmic web, representing the extensive and aligned distributions of galaxies and gas. Using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we report the detection of a filament in the Ursa Major supergroup using atomic-hydrogen (HI) observations. This filament consists of sixteen various types of galaxies and five starless gas clumps, spanning a length of approximately 0.9 Mpc. Notably, it is extremely thin, with a thickness comparable to the diameter of a galaxy. We observed a galaxy-filament spin alignment and a velocity gradient within the filament. These findings strongly suggest a cold accretion flow along the filament, potentially contributing to the formation and growth of the galaxies. The thin filament, as a small group, is likely to be merged into the Ursa Major supergroup in the context of hierarchical structure formation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16408 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Unveiling a Thin Filament of the Cosmic Web in the Ursa Major Supergroup Xu, Jin-Long Zhu, Ming Jiang, Peng Yu, Nai-Ping Zhang, Chuan-Peng Liu, Xiao-Lan Ai, Mei Jing, Yin-Jie Wang, Jie Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Filaments are crucial components of the cosmic web, representing the extensive and aligned distributions of galaxies and gas. Using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we report the detection of a filament in the Ursa Major supergroup using atomic-hydrogen (HI) observations. This filament consists of sixteen various types of galaxies and five starless gas clumps, spanning a length of approximately 0.9 Mpc. Notably, it is extremely thin, with a thickness comparable to the diameter of a galaxy. We observed a galaxy-filament spin alignment and a velocity gradient within the filament. These findings strongly suggest a cold accretion flow along the filament, potentially contributing to the formation and growth of the galaxies. The thin filament, as a small group, is likely to be merged into the Ursa Major supergroup in the context of hierarchical structure formation. |
| title | Unveiling a Thin Filament of the Cosmic Web in the Ursa Major Supergroup |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.16408 |