Misaligned gas acquisition as a formation pathway of S0 galaxies
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866914992459087872 |
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| author | Zhou, Yuren Chen, Yanmei Shi, Yong Gu, Qiusheng Wang, Junfeng Bizyaev, Dmitry |
| author_facet | Zhou, Yuren Chen, Yanmei Shi, Yong Gu, Qiusheng Wang, Junfeng Bizyaev, Dmitry |
| contents | We analyze a sample of 753 S0 galaxies from the MPL-10 of MaNGA survey and investigate the gas-star kinematic misalignment and merger remnant fraction in galaxies with different morphological types. The misalign fraction in S0s is the highest among all the morphological types for both young (global $\mathrm{D}_n4000<1.6$, $\sim$15%) and old (global $\mathrm{D}_n4000>1.6$, $\sim$10%) galaxies. We compare the properties of misaligned S0s with other types of galaxies, finding: (i) misaligned S0s and misaligned spirals have higher bulge luminosity, higher B/T and larger Sérsic index compared to spirals; (ii) the misaligned S0s have lower bulge luminosity $M_r$ and smaller bulge size than merger remnant S0s, while aligned S0s have the widest coverage for these parameter distributions which are overlapped with both misaligned S0s and merger remnant S0s; (iii) misaligned S0s have lower stellar mass $M_*$ and more isolated environment than aligned S0s and merger remnant S0s; (iv) the young misaligned S0s have positive $\mathrm{D}_n4000$ radial gradient, while the aligned S0s and merger remnant S0s show negative $\mathrm{D}_n4000$ radial gradient. Combining all these observational results, we suggest misaligned gas acquisition as another efficient formation pathway for S0 galaxies. The redistribution of gas angular momentum during gas-gas collision between accreted and pre-existing gas leads to gas inflow and the growth of bulge component, meanwhile the lack of cold gas at the outskirts leads to fading of spiral arms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_00384 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Misaligned gas acquisition as a formation pathway of S0 galaxies Zhou, Yuren Chen, Yanmei Shi, Yong Gu, Qiusheng Wang, Junfeng Bizyaev, Dmitry Astrophysics of Galaxies We analyze a sample of 753 S0 galaxies from the MPL-10 of MaNGA survey and investigate the gas-star kinematic misalignment and merger remnant fraction in galaxies with different morphological types. The misalign fraction in S0s is the highest among all the morphological types for both young (global $\mathrm{D}_n4000<1.6$, $\sim$15%) and old (global $\mathrm{D}_n4000>1.6$, $\sim$10%) galaxies. We compare the properties of misaligned S0s with other types of galaxies, finding: (i) misaligned S0s and misaligned spirals have higher bulge luminosity, higher B/T and larger Sérsic index compared to spirals; (ii) the misaligned S0s have lower bulge luminosity $M_r$ and smaller bulge size than merger remnant S0s, while aligned S0s have the widest coverage for these parameter distributions which are overlapped with both misaligned S0s and merger remnant S0s; (iii) misaligned S0s have lower stellar mass $M_*$ and more isolated environment than aligned S0s and merger remnant S0s; (iv) the young misaligned S0s have positive $\mathrm{D}_n4000$ radial gradient, while the aligned S0s and merger remnant S0s show negative $\mathrm{D}_n4000$ radial gradient. Combining all these observational results, we suggest misaligned gas acquisition as another efficient formation pathway for S0 galaxies. The redistribution of gas angular momentum during gas-gas collision between accreted and pre-existing gas leads to gas inflow and the growth of bulge component, meanwhile the lack of cold gas at the outskirts leads to fading of spiral arms. |
| title | Misaligned gas acquisition as a formation pathway of S0 galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2303.00384 |