Halo Spin Depends on The Distance to Cosmic Filament
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866915906959966208 |
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| author | Liu, Shihong Rong, Yu |
| author_facet | Liu, Shihong Rong, Yu |
| contents | We employ a semi-analytical methodology to estimate the dark matter halo spin of HI-rich galaxies in the Arecibo Legacy Fast Alfa Survey and investigate the relationship between halo spin and the proximity of galaxies to cosmic filaments. We exclude galaxies with low HI signal-to-noise ratios, those potentially influenced by velocity dispersions, and those affiliated with galaxy clusters/groups. Additionally, we apply a mass-weighting technique to ensure consistent mass distribution across galaxy samples at varying distances from filaments. Our analysis reveals, for the first time, a subtle yet statistically significant correlation between halo spin and filament distance in observational data, indicating higher spins closer to filaments. This suggests that the tidal forces exerted by filaments may impact the spin of dark matter halos. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_11443 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Halo Spin Depends on The Distance to Cosmic Filament Liu, Shihong Rong, Yu Astrophysics of Galaxies We employ a semi-analytical methodology to estimate the dark matter halo spin of HI-rich galaxies in the Arecibo Legacy Fast Alfa Survey and investigate the relationship between halo spin and the proximity of galaxies to cosmic filaments. We exclude galaxies with low HI signal-to-noise ratios, those potentially influenced by velocity dispersions, and those affiliated with galaxy clusters/groups. Additionally, we apply a mass-weighting technique to ensure consistent mass distribution across galaxy samples at varying distances from filaments. Our analysis reveals, for the first time, a subtle yet statistically significant correlation between halo spin and filament distance in observational data, indicating higher spins closer to filaments. This suggests that the tidal forces exerted by filaments may impact the spin of dark matter halos. |
| title | Halo Spin Depends on The Distance to Cosmic Filament |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.11443 |