What role of gravity, turbulence and magnetic fields in high-mass star formation clouds?
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914788473307136 |
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| author | Luo, An-Xu Liu, Hong-Li Li, Guang-Xing Pan, Sirong Yang, Dong-Ting |
| author_facet | Luo, An-Xu Liu, Hong-Li Li, Guang-Xing Pan, Sirong Yang, Dong-Ting |
| contents | To explore the potential role of gravity, turbulence and magnetic fields in high-mass star formation in molecular clouds, this study revisits the velocity dispersion--size ($σ$--$L$) and density--size ($ρ$--$L$) scalings and the associated turbulent energy spectrum using an extensive data sample. The sample includes various hierarchical density structures in high-mass star formation clouds, across scales of 0.01 to 100 pc. We observe $σ\propto L^{0.26}$ and $ρ\propto L^{-1.54}$ scalings, converging toward a virial equilibrium state. A nearly flat virial parameter--mass ($α_{\rm vir}-M$) distribution is seen across all density scales, with $α_{\rm vir}$ values centered around unity, suggesting a global equilibrium maintained by the interplay between gravity and turbulence across multiple scales. Our turbulent energy spectrum ($E(k)$) analysis, based on the $σ$--$L$ and $ρ$--$L$ scalings, yields a characteristic $E(k) \propto k^{-1.52}$. These findings indicate the potential significance of gravity, turbulence, and possibly magnetic fields all in regulating dynamics of molecular clouds and high-mass star formation therein. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_05063 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | What role of gravity, turbulence and magnetic fields in high-mass star formation clouds? Luo, An-Xu Liu, Hong-Li Li, Guang-Xing Pan, Sirong Yang, Dong-Ting Astrophysics of Galaxies To explore the potential role of gravity, turbulence and magnetic fields in high-mass star formation in molecular clouds, this study revisits the velocity dispersion--size ($σ$--$L$) and density--size ($ρ$--$L$) scalings and the associated turbulent energy spectrum using an extensive data sample. The sample includes various hierarchical density structures in high-mass star formation clouds, across scales of 0.01 to 100 pc. We observe $σ\propto L^{0.26}$ and $ρ\propto L^{-1.54}$ scalings, converging toward a virial equilibrium state. A nearly flat virial parameter--mass ($α_{\rm vir}-M$) distribution is seen across all density scales, with $α_{\rm vir}$ values centered around unity, suggesting a global equilibrium maintained by the interplay between gravity and turbulence across multiple scales. Our turbulent energy spectrum ($E(k)$) analysis, based on the $σ$--$L$ and $ρ$--$L$ scalings, yields a characteristic $E(k) \propto k^{-1.52}$. These findings indicate the potential significance of gravity, turbulence, and possibly magnetic fields all in regulating dynamics of molecular clouds and high-mass star formation therein. |
| title | What role of gravity, turbulence and magnetic fields in high-mass star formation clouds? |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.05063 |