On the role of non-circular motions in MaNGA galaxies I: global properties
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909371667054592 |
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| author | Lopez-Coba, Carlos Lin, Lihwai Neumann, Justus Bershady, Matthew A. |
| author_facet | Lopez-Coba, Carlos Lin, Lihwai Neumann, Justus Bershady, Matthew A. |
| contents | Non-circular (NC) motions represent the imprints of non-axisymmetric structures in galaxies, providing opportunities to study the physical properties of gas departing from circular rotation. In this work, we have conducted a systematic study of the non-circular motions in a sample of 1624 gas-rich disk galaxies from the MaNGA MPL-11. By using the H$α$ velocity as a tracer of the disk rotation, we find indications that the amplitude of the non-circular motions is related to the stellar mass, with the low mass and late-type galaxies the most affected. In our sample, we find ratios of non-circular to circular rotation ranging from 5% to 20%. By implementing harmonic models to include NC motions associated with spiral arms and stellar bars, we find that the rotational curves traced with H$α$ are barely affected by the NC induced by these structures. Consequently, in our sample, we do not find evidence that NC motions contribute to the scatter of the stellar Tully-Fisher relation. Our results suggest that non-circular motions might have a more localized effect in galaxies rather than a global one. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_21147 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On the role of non-circular motions in MaNGA galaxies I: global properties Lopez-Coba, Carlos Lin, Lihwai Neumann, Justus Bershady, Matthew A. Astrophysics of Galaxies Non-circular (NC) motions represent the imprints of non-axisymmetric structures in galaxies, providing opportunities to study the physical properties of gas departing from circular rotation. In this work, we have conducted a systematic study of the non-circular motions in a sample of 1624 gas-rich disk galaxies from the MaNGA MPL-11. By using the H$α$ velocity as a tracer of the disk rotation, we find indications that the amplitude of the non-circular motions is related to the stellar mass, with the low mass and late-type galaxies the most affected. In our sample, we find ratios of non-circular to circular rotation ranging from 5% to 20%. By implementing harmonic models to include NC motions associated with spiral arms and stellar bars, we find that the rotational curves traced with H$α$ are barely affected by the NC induced by these structures. Consequently, in our sample, we do not find evidence that NC motions contribute to the scatter of the stellar Tully-Fisher relation. Our results suggest that non-circular motions might have a more localized effect in galaxies rather than a global one. |
| title | On the role of non-circular motions in MaNGA galaxies I: global properties |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.21147 |