The impact of external gas accretion on the distribution of HI gas in galaxies
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arXiv
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| Format: | Preprint |
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2025
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| author | Zhang, Qianhan Bao, Min Chen, Yanmei Yu, Niankun Shi, Yong Ho, Luis C. |
| author_facet | Zhang, Qianhan Bao, Min Chen, Yanmei Yu, Niankun Shi, Yong Ho, Luis C. |
| contents | Using the data from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) and HI-MaNGA surveys, we build a sample of 37 gas-star misaligned galaxies with robust HI detections, which are believed to have undergone external gas accretion processes. Both star-forming (SF) and quiescent (QS) misaligned galaxies exhibit narrower HI linewidths compared to their gas-star aligned controls. The HI profiles of SF misaligned galaxies tend to be single-peaked, displaying a slightly higher fraction of single-peaked shape compared to their aligned controls. The QS misaligned galaxies exhibit prominently single-peaked HI profiles, while their aligned controls show distinct double-horned profiles. The shape of HI profiles is expected to change with the HI surface density radial gradients through external gas accretion -- the interaction between the accreted gas and the pre-existing gas leads to the re-distribution of angular momentum and induces gas inflow. It suggests that the progenitors of SF misaligned galaxies are central HI-enriched, in this case, the shape of HI profiles is insensitive to the further increase of central HI surface density. The progenitors of QS misaligned galaxies are central HI-deficient, hence the transition from central HI-deficient to HI-enriched surface density leads to significantly more single-peaked HI profiles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_11891 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The impact of external gas accretion on the distribution of HI gas in galaxies Zhang, Qianhan Bao, Min Chen, Yanmei Yu, Niankun Shi, Yong Ho, Luis C. Astrophysics of Galaxies Using the data from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) and HI-MaNGA surveys, we build a sample of 37 gas-star misaligned galaxies with robust HI detections, which are believed to have undergone external gas accretion processes. Both star-forming (SF) and quiescent (QS) misaligned galaxies exhibit narrower HI linewidths compared to their gas-star aligned controls. The HI profiles of SF misaligned galaxies tend to be single-peaked, displaying a slightly higher fraction of single-peaked shape compared to their aligned controls. The QS misaligned galaxies exhibit prominently single-peaked HI profiles, while their aligned controls show distinct double-horned profiles. The shape of HI profiles is expected to change with the HI surface density radial gradients through external gas accretion -- the interaction between the accreted gas and the pre-existing gas leads to the re-distribution of angular momentum and induces gas inflow. It suggests that the progenitors of SF misaligned galaxies are central HI-enriched, in this case, the shape of HI profiles is insensitive to the further increase of central HI surface density. The progenitors of QS misaligned galaxies are central HI-deficient, hence the transition from central HI-deficient to HI-enriched surface density leads to significantly more single-peaked HI profiles. |
| title | The impact of external gas accretion on the distribution of HI gas in galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2509.11891 |