Misaligned external gas acquisition boosts central black hole activities
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911031786209280 |
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| author | Zhou, Yuren Chen, Yanmei Shi, Yong Kauffmann, Guinevere Wang, Junfeng Jin, Gaoxiang Wang, Lan Feng, Shuai Bao, Min |
| author_facet | Zhou, Yuren Chen, Yanmei Shi, Yong Kauffmann, Guinevere Wang, Junfeng Jin, Gaoxiang Wang, Lan Feng, Shuai Bao, Min |
| contents | One important question in active galactic nucleus (AGN) is how gas is brought down to the galaxy center. Both internal secular evolution (torque induced by non-axisymmetric galactic structures such as bars) and external processes (e.g. mergers or interactions) are expected to redistribute the angular momentum (AM) and transport gas inward. However, it is still under debate whether these processes can significantly affect AGN activities. Here we for the first time report that AGN fraction increases with the difference of kinematic position angles ($ΔPA\equiv|PA_{\mathrm{gas}}-PA_{\mathrm{star}}|$) between ionized gas ($PA_{\mathrm{gas}}$) and stellar disks ($PA_{\mathrm{star}}$) in blue and green galaxies, meanwhile this fraction remains roughly constant for red galaxies. Also the high luminosity AGN fraction increases with $ΔPA$ while the low luminosity AGN fraction is independent with $ΔPA$. These observational results support a scenario in which the interaction between accreted and pre-existing gas provides the AM loss mechanism, thereby the gas inflow fuels the central BH activities, and the AM loss efficiency is positively correlated with the $ΔPA$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_00627 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Misaligned external gas acquisition boosts central black hole activities Zhou, Yuren Chen, Yanmei Shi, Yong Kauffmann, Guinevere Wang, Junfeng Jin, Gaoxiang Wang, Lan Feng, Shuai Bao, Min Astrophysics of Galaxies One important question in active galactic nucleus (AGN) is how gas is brought down to the galaxy center. Both internal secular evolution (torque induced by non-axisymmetric galactic structures such as bars) and external processes (e.g. mergers or interactions) are expected to redistribute the angular momentum (AM) and transport gas inward. However, it is still under debate whether these processes can significantly affect AGN activities. Here we for the first time report that AGN fraction increases with the difference of kinematic position angles ($ΔPA\equiv|PA_{\mathrm{gas}}-PA_{\mathrm{star}}|$) between ionized gas ($PA_{\mathrm{gas}}$) and stellar disks ($PA_{\mathrm{star}}$) in blue and green galaxies, meanwhile this fraction remains roughly constant for red galaxies. Also the high luminosity AGN fraction increases with $ΔPA$ while the low luminosity AGN fraction is independent with $ΔPA$. These observational results support a scenario in which the interaction between accreted and pre-existing gas provides the AM loss mechanism, thereby the gas inflow fuels the central BH activities, and the AM loss efficiency is positively correlated with the $ΔPA$. |
| title | Misaligned external gas acquisition boosts central black hole activities |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2507.00627 |