Evolution of the Angular Momentum of Molecular Cloud Cores Formed from Filament Fragmentation
The angular momentum of molecular cloud cores plays an important role in the process of star formation. However, the time evolution of the angular momentum of molecular cloud cores is still unclear. In this paper, we perform three-dimensional simulations to investigate the time evolution of the angu...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/aca88d |
| _version_ | 1827831480297979904 |
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| author | Yoshiaki Misugi Shu-ichiro Inutsuka Doris Arzoumanian |
| author_facet | Yoshiaki Misugi Shu-ichiro Inutsuka Doris Arzoumanian |
| author_sort | Yoshiaki Misugi |
| collection | DOAJ |
| description | The angular momentum of molecular cloud cores plays an important role in the process of star formation. However, the time evolution of the angular momentum of molecular cloud cores is still unclear. In this paper, we perform three-dimensional simulations to investigate the time evolution of the angular momentum of molecular cloud cores formed through filament fragmentation. As a result, we find that most of the cores rotate perpendicular to the filament axis. The mean angular momentum of the cores changes by only around 30% during the initial stage of their formation process and then remains almost constant. In addition, we analyze the internal angular momentum structure of the cores. Although the cores gain angular momentum with various directions from the initial turbulent velocity fluctuations of their parent filaments, the angular momentum profile in each core converges to the self-similar solution. We also show that the degree of complexity of the angular momentum structure in a core decreases slightly with time. Moreover, we perform synthetic observations and show that the angular momentum profile measured from the synthetic mean velocity map is compatible with the observations when the filament inclination is taken into account. The present study suggests a theory of core formation from filament fragmentation where the angular momentum structures of the cores are determined by the velocity fluctuation along the filaments and both are compatible with the observations. This theory also provides new insights into the core properties that could be tested observationally. |
| first_indexed | 2024-03-12T04:45:19Z |
| format | Article |
| id | doaj.art-bae019ab4585428399e2555d8864f053 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:45:19Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-bae019ab4585428399e2555d8864f0532023-09-03T09:29:25ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194327610.3847/1538-4357/aca88dEvolution of the Angular Momentum of Molecular Cloud Cores Formed from Filament FragmentationYoshiaki Misugi0https://orcid.org/0000-0002-4093-6925Shu-ichiro Inutsuka1https://orcid.org/0000-0003-4366-6518Doris Arzoumanian2https://orcid.org/0000-0002-1959-7201Department of Physics, Graduate School of Science, Nagoya University , 464-8602 Nagoya, Japan ; misugi@sci.kagoshima-u.ac.jp; Graduate Schools of Science and Engineering, Kagoshima University , 890-8580 Kagoshima, JapanDepartment of Physics, Graduate School of Science, Nagoya University , 464-8602 Nagoya, Japan ; misugi@sci.kagoshima-u.ac.jpDivision of Science, National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; Aix Marseille Univ , CNRS, CNES, LAM, Marseille, FranceThe angular momentum of molecular cloud cores plays an important role in the process of star formation. However, the time evolution of the angular momentum of molecular cloud cores is still unclear. In this paper, we perform three-dimensional simulations to investigate the time evolution of the angular momentum of molecular cloud cores formed through filament fragmentation. As a result, we find that most of the cores rotate perpendicular to the filament axis. The mean angular momentum of the cores changes by only around 30% during the initial stage of their formation process and then remains almost constant. In addition, we analyze the internal angular momentum structure of the cores. Although the cores gain angular momentum with various directions from the initial turbulent velocity fluctuations of their parent filaments, the angular momentum profile in each core converges to the self-similar solution. We also show that the degree of complexity of the angular momentum structure in a core decreases slightly with time. Moreover, we perform synthetic observations and show that the angular momentum profile measured from the synthetic mean velocity map is compatible with the observations when the filament inclination is taken into account. The present study suggests a theory of core formation from filament fragmentation where the angular momentum structures of the cores are determined by the velocity fluctuation along the filaments and both are compatible with the observations. This theory also provides new insights into the core properties that could be tested observationally.https://doi.org/10.3847/1538-4357/aca88dMolecular cloudsStar formationStellar rotationMultiple stars |
| spellingShingle | Yoshiaki Misugi Shu-ichiro Inutsuka Doris Arzoumanian Evolution of the Angular Momentum of Molecular Cloud Cores Formed from Filament Fragmentation The Astrophysical Journal Molecular clouds Star formation Stellar rotation Multiple stars |
| title | Evolution of the Angular Momentum of Molecular Cloud Cores Formed from Filament Fragmentation |
| title_full | Evolution of the Angular Momentum of Molecular Cloud Cores Formed from Filament Fragmentation |
| title_fullStr | Evolution of the Angular Momentum of Molecular Cloud Cores Formed from Filament Fragmentation |
| title_full_unstemmed | Evolution of the Angular Momentum of Molecular Cloud Cores Formed from Filament Fragmentation |
| title_short | Evolution of the Angular Momentum of Molecular Cloud Cores Formed from Filament Fragmentation |
| title_sort | evolution of the angular momentum of molecular cloud cores formed from filament fragmentation |
| topic | Molecular clouds Star formation Stellar rotation Multiple stars |
| url | https://doi.org/10.3847/1538-4357/aca88d |
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