On the Spatial Distribution of 13CO Structures within 12CO Molecular Clouds
We look into the 2851 ^12 CO molecular clouds harboring ^13 CO structures to reveal the distribution of the projected angular separations and radial velocity separations between their internal ^13 CO structures. The projected angular separations are determined using the minimal spanning tree algorit...
| 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/acac26 |
| _version_ | 1797701237715501056 |
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| author | Lixia Yuan Ji Yang Fujun Du Xunchuan Liu Yang Su Qing-Zeng Yan Xuepeng Chen Yan Sun Shaobo Zhang Xin Zhou Yuehui Ma |
| author_facet | Lixia Yuan Ji Yang Fujun Du Xunchuan Liu Yang Su Qing-Zeng Yan Xuepeng Chen Yan Sun Shaobo Zhang Xin Zhou Yuehui Ma |
| author_sort | Lixia Yuan |
| collection | DOAJ |
| description | We look into the 2851 ^12 CO molecular clouds harboring ^13 CO structures to reveal the distribution of the projected angular separations and radial velocity separations between their internal ^13 CO structures. The projected angular separations are determined using the minimal spanning tree algorithm. We find that ∼50% of the angular separations fall in a narrow range of ∼3′–7′ with a median of ∼5′, and the corresponding radial velocity separations mainly range from ∼0.3 to 2.5 km s ^−1 . The mean and standard deviation of the angular separations of the internal ^13 CO structures within ^12 CO clouds appear to be universal, independent of the ^12 CO cloud angular areas and the counts of their internal ^13 CO structures. We also reveal a scaling relation between the ^12 CO cloud angular area and its harbored ^13 CO structure count. These results suggest there is a preferred angular separation between ^13 CO structures in these ^12 CO clouds, considering the distance effects. According to that, we propose an alternative picture for the assembly and destruction of molecular clouds: there is a fundamental separation for the internal structures of molecular clouds, the build-up and destruction of molecular clouds proceeds under this fundamental unit. |
| first_indexed | 2024-03-12T04:33:35Z |
| format | Article |
| id | doaj.art-277ab8104a164e4aa2effb0a6833f1a4 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:33:35Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-277ab8104a164e4aa2effb0a6833f1a42023-09-03T09:58:16ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194419110.3847/1538-4357/acac26On the Spatial Distribution of 13CO Structures within 12CO Molecular CloudsLixia Yuan0https://orcid.org/0000-0003-0804-9055Ji Yang1https://orcid.org/0000-0001-7768-7320Fujun Du2https://orcid.org/0000-0002-7489-0179Xunchuan Liu3https://orcid.org/0000-0001-8315-4248Yang Su4https://orcid.org/0000-0002-0197-470XQing-Zeng Yan5https://orcid.org/0000-0003-4586-7751Xuepeng Chen6https://orcid.org/0000-0003-3151-8964Yan Sun7https://orcid.org/0000-0002-3904-1622Shaobo Zhang8https://orcid.org/0000-0003-2549-7247Xin Zhou9https://orcid.org/0000-0003-2418-3350Yuehui Ma10https://orcid.org/0000-0002-8051-5228Purple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnPurple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnPurple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnShanghai Astronomical Observatory, Chinese Academy of Sciences , People’s Republic of ChinaPurple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnPurple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnPurple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnPurple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnPurple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnPurple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnPurple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Qixia District, Nanjing 210033, People’s Republic of China ; jiyang@pmo.ac.cnWe look into the 2851 ^12 CO molecular clouds harboring ^13 CO structures to reveal the distribution of the projected angular separations and radial velocity separations between their internal ^13 CO structures. The projected angular separations are determined using the minimal spanning tree algorithm. We find that ∼50% of the angular separations fall in a narrow range of ∼3′–7′ with a median of ∼5′, and the corresponding radial velocity separations mainly range from ∼0.3 to 2.5 km s ^−1 . The mean and standard deviation of the angular separations of the internal ^13 CO structures within ^12 CO clouds appear to be universal, independent of the ^12 CO cloud angular areas and the counts of their internal ^13 CO structures. We also reveal a scaling relation between the ^12 CO cloud angular area and its harbored ^13 CO structure count. These results suggest there is a preferred angular separation between ^13 CO structures in these ^12 CO clouds, considering the distance effects. According to that, we propose an alternative picture for the assembly and destruction of molecular clouds: there is a fundamental separation for the internal structures of molecular clouds, the build-up and destruction of molecular clouds proceeds under this fundamental unit.https://doi.org/10.3847/1538-4357/acac26Interstellar mediumInterstellar moleculesMolecular clouds |
| spellingShingle | Lixia Yuan Ji Yang Fujun Du Xunchuan Liu Yang Su Qing-Zeng Yan Xuepeng Chen Yan Sun Shaobo Zhang Xin Zhou Yuehui Ma On the Spatial Distribution of 13CO Structures within 12CO Molecular Clouds The Astrophysical Journal Interstellar medium Interstellar molecules Molecular clouds |
| title | On the Spatial Distribution of 13CO Structures within 12CO Molecular Clouds |
| title_full | On the Spatial Distribution of 13CO Structures within 12CO Molecular Clouds |
| title_fullStr | On the Spatial Distribution of 13CO Structures within 12CO Molecular Clouds |
| title_full_unstemmed | On the Spatial Distribution of 13CO Structures within 12CO Molecular Clouds |
| title_short | On the Spatial Distribution of 13CO Structures within 12CO Molecular Clouds |
| title_sort | on the spatial distribution of 13co structures within 12co molecular clouds |
| topic | Interstellar medium Interstellar molecules Molecular clouds |
| url | https://doi.org/10.3847/1538-4357/acac26 |
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