IC 5146 Dark Streamer: The First Reliable Candidate of Edge Collapse, Hub-filament Systems, and Intertwined Sub-filaments
The paper presents an analysis of multiwavelength data of a nearby star-forming site, the IC 5146 dark streamer ( d ∼ 600 pc), which has been treated as a single and long filament, fl . Two hub-filament systems (HFSs) are known to exist toward the eastern and the western ends of fl . Earlier publish...
| 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 |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/acbccc |
| _version_ | 1797701372897918976 |
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| author | L. K. Dewangan N. K. Bhadari A. Men’shchikov E. J. Chung R. Devaraj C. W. Lee A. K. Maity T. Baug |
| author_facet | L. K. Dewangan N. K. Bhadari A. Men’shchikov E. J. Chung R. Devaraj C. W. Lee A. K. Maity T. Baug |
| author_sort | L. K. Dewangan |
| collection | DOAJ |
| description | The paper presents an analysis of multiwavelength data of a nearby star-forming site, the IC 5146 dark streamer ( d ∼ 600 pc), which has been treated as a single and long filament, fl . Two hub-filament systems (HFSs) are known to exist toward the eastern and the western ends of fl . Earlier published results favor simultaneous evidence of HFSs and end-dominated collapse (EDC) in fl . A Herschel column density map (resolution ∼13.″5) reveals two intertwined sub-filaments (i.e., fl-A and fl-B ) toward fl , displaying a nearly double helix-like structure. This picture is also supported by the C ^18 O(3–2) emission. The fray and fragment scenario may explain the origin of intertwined sub-filaments. In the direction of fl , two cloud components around 2 and 4 km s ^−1 are depicted using ^13 CO(1–0) and C ^18 O(1–0) emission and are connected in velocity space. The HFSs are spatially found at the overlapping areas of these cloud components and can be explained by the cloud–cloud collision scenario. Nonthermal gas motion in fl with a larger Mach number is found. The magnetic field position angle measured from the filament’s long axis shows a linear trend along the filament. This signature is confirmed in the other nearby EDC filaments, presenting a more quantitative confirmation of the EDC scenario. Based on our observational outcomes, we witness multiple processes operational in the IC 5146 streamer. Overall, the streamer can be recognized as the first reliable candidate for edge collapse, HFSs, and intertwined sub-filaments. |
| first_indexed | 2024-03-12T04:35:32Z |
| format | Article |
| id | doaj.art-1e9ceb5b794540c9895f8046a19a006a |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:35:32Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-1e9ceb5b794540c9895f8046a19a006a2023-09-03T09:56:16ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194612210.3847/1538-4357/acbcccIC 5146 Dark Streamer: The First Reliable Candidate of Edge Collapse, Hub-filament Systems, and Intertwined Sub-filamentsL. K. Dewangan0https://orcid.org/0000-0001-6725-0483N. K. Bhadari1https://orcid.org/0000-0001-8812-8460A. Men’shchikov2https://orcid.org/0000-0001-5201-5595E. J. Chung3https://orcid.org/0000-0003-0014-1527R. Devaraj4https://orcid.org/0000-0001-9217-3168C. W. Lee5https://orcid.org/0000-0002-3179-6334A. K. Maity6https://orcid.org/0000-0002-7367-9355T. Baug7https://orcid.org/0000-0003-0295-6586Astronomy & Astrophysics Division , Physical Research Laboratory, Navrangpura, Ahmedabad 380009, India ; lokeshd@prl.res.inAstronomy & Astrophysics Division , Physical Research Laboratory, Navrangpura, Ahmedabad 380009, India ; lokeshd@prl.res.in; Indian Institute of Technology Gandhinagar Palaj , Gandhinagar 382355, IndiaUniversité Paris-Saclay, Université Paris Cité , CEA, CNRS, AIM, F-91191, Gif-sur-Yvette, FranceDepartment of Astronomy and Space Science, Chungnam National University , Daejeon, Republic of KoreaDublin Institute for Advanced Studies , 31 Fitzwilliam Place, Dublin D02XF86, IrelandKorea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; University of Science and Technology , Korea (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of KoreaAstronomy & Astrophysics Division , Physical Research Laboratory, Navrangpura, Ahmedabad 380009, India ; lokeshd@prl.res.in; Indian Institute of Technology Gandhinagar Palaj , Gandhinagar 382355, IndiaSatyendra Nath Bose National Centre for Basic Sciences , Block-JD, Sector-III, Salt Lake, Kolkata-700 106, IndiaThe paper presents an analysis of multiwavelength data of a nearby star-forming site, the IC 5146 dark streamer ( d ∼ 600 pc), which has been treated as a single and long filament, fl . Two hub-filament systems (HFSs) are known to exist toward the eastern and the western ends of fl . Earlier published results favor simultaneous evidence of HFSs and end-dominated collapse (EDC) in fl . A Herschel column density map (resolution ∼13.″5) reveals two intertwined sub-filaments (i.e., fl-A and fl-B ) toward fl , displaying a nearly double helix-like structure. This picture is also supported by the C ^18 O(3–2) emission. The fray and fragment scenario may explain the origin of intertwined sub-filaments. In the direction of fl , two cloud components around 2 and 4 km s ^−1 are depicted using ^13 CO(1–0) and C ^18 O(1–0) emission and are connected in velocity space. The HFSs are spatially found at the overlapping areas of these cloud components and can be explained by the cloud–cloud collision scenario. Nonthermal gas motion in fl with a larger Mach number is found. The magnetic field position angle measured from the filament’s long axis shows a linear trend along the filament. This signature is confirmed in the other nearby EDC filaments, presenting a more quantitative confirmation of the EDC scenario. Based on our observational outcomes, we witness multiple processes operational in the IC 5146 streamer. Overall, the streamer can be recognized as the first reliable candidate for edge collapse, HFSs, and intertwined sub-filaments.https://doi.org/10.3847/1538-4357/acbcccStar forming regionsH II regionsMolecular cloudsInterstellar emissionsYoung stellar objects |
| spellingShingle | L. K. Dewangan N. K. Bhadari A. Men’shchikov E. J. Chung R. Devaraj C. W. Lee A. K. Maity T. Baug IC 5146 Dark Streamer: The First Reliable Candidate of Edge Collapse, Hub-filament Systems, and Intertwined Sub-filaments The Astrophysical Journal Star forming regions H II regions Molecular clouds Interstellar emissions Young stellar objects |
| title | IC 5146 Dark Streamer: The First Reliable Candidate of Edge Collapse, Hub-filament Systems, and Intertwined Sub-filaments |
| title_full | IC 5146 Dark Streamer: The First Reliable Candidate of Edge Collapse, Hub-filament Systems, and Intertwined Sub-filaments |
| title_fullStr | IC 5146 Dark Streamer: The First Reliable Candidate of Edge Collapse, Hub-filament Systems, and Intertwined Sub-filaments |
| title_full_unstemmed | IC 5146 Dark Streamer: The First Reliable Candidate of Edge Collapse, Hub-filament Systems, and Intertwined Sub-filaments |
| title_short | IC 5146 Dark Streamer: The First Reliable Candidate of Edge Collapse, Hub-filament Systems, and Intertwined Sub-filaments |
| title_sort | ic 5146 dark streamer the first reliable candidate of edge collapse hub filament systems and intertwined sub filaments |
| topic | Star forming regions H II regions Molecular clouds Interstellar emissions Young stellar objects |
| url | https://doi.org/10.3847/1538-4357/acbccc |
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