Magnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization Gaps
We study the magnetic field structures in six giant filaments associated with the spiral arms of the Milky Way by applying the velocity gradient technique (VGT) to the ^13 CO spectroscopic data from the GRS, FUGIN, and SEDIGSM surveys. Unlike dust-polarized emission, the VGT allows us to separate th...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad09df |
| _version_ | 1797352221704192000 |
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| author | Mengke Zhao Guang-Xing Li Jianjun Zhou Xindi Tang Jarken Esimbek Yuxin He Dalei Li Weiguang Ji Zhengxue Chang Kadirya Tursun |
| author_facet | Mengke Zhao Guang-Xing Li Jianjun Zhou Xindi Tang Jarken Esimbek Yuxin He Dalei Li Weiguang Ji Zhengxue Chang Kadirya Tursun |
| author_sort | Mengke Zhao |
| collection | DOAJ |
| description | We study the magnetic field structures in six giant filaments associated with the spiral arms of the Milky Way by applying the velocity gradient technique (VGT) to the ^13 CO spectroscopic data from the GRS, FUGIN, and SEDIGSM surveys. Unlike dust-polarized emission, the VGT allows us to separate the foreground and background using the velocity information, from which the orientation of the magnetic field can be reliably determined. We find that in most cases the magnetic fields stay aligned with the filament bodies, which are parallel to the disk midplane. Among these, G29, G47, and G51 exhibit smooth magnetic fields, and G24, G339, and G349 exhibit discontinuities. The fact that most filaments have magnetic fields that stay aligned with the Galactic disk midplane suggests that Galactic shear may be responsible for shaping the filaments. The fact that the magnetic field can stay regular at the resolution of our analysis (≲10 pc), where the turbulence crossing time is short compared to the shear time, suggests that turbulent motion cannot effectively disrupt the regular orientation of the magnetic field. The discontinuities found in some filaments can be caused by processes including filament reassembly, gravitational collapse, and stellar feedback. |
| first_indexed | 2024-03-08T13:12:10Z |
| format | Article |
| id | doaj.art-497f51a7b2294b5aa8313b39fb64332d |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-08T13:12:10Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-497f51a7b2294b5aa8313b39fb64332d2024-01-18T11:11:10ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01961112410.3847/1538-4357/ad09dfMagnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization GapsMengke Zhao0https://orcid.org/0000-0003-0596-6608Guang-Xing Li1https://orcid.org/0000-0003-3144-1952Jianjun Zhou2https://orcid.org/0000-0003-0356-818XXindi Tang3https://orcid.org/0000-0002-4154-4309Jarken Esimbek4Yuxin He5https://orcid.org/0000-0002-8760-8988Dalei Li6Weiguang Ji7Zhengxue Chang8Kadirya Tursun9Xinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; mkzhao628@gmail.com; University of Chinese Academy of Sciences , Beijing, 100049, People's Republic of ChinaSouth-Western Institute for Astronomy Research, Yunnan University , Kunming, 650500 Yunnan, People's Republic of China ; gxli@ynu.edu.cnXinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; mkzhao628@gmail.com; Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; zhoujj@xao.ac.cn; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People's Republic of ChinaXinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; mkzhao628@gmail.com; University of Chinese Academy of Sciences , Beijing, 100049, People's Republic of China; Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; zhoujj@xao.ac.cn; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People's Republic of ChinaXinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; mkzhao628@gmail.com; Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; zhoujj@xao.ac.cn; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People's Republic of ChinaXinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; mkzhao628@gmail.com; University of Chinese Academy of Sciences , Beijing, 100049, People's Republic of China; Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; zhoujj@xao.ac.cn; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People's Republic of ChinaXinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; mkzhao628@gmail.com; University of Chinese Academy of Sciences , Beijing, 100049, People's Republic of China; Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; zhoujj@xao.ac.cn; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People's Republic of ChinaXinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; mkzhao628@gmail.comCollege of Mathematics and Physics, Handan University , No.530 Xueyuan Road, Hanshang District, 056005 Handan, People’s Republic of ChinaXinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China ; mkzhao628@gmail.comWe study the magnetic field structures in six giant filaments associated with the spiral arms of the Milky Way by applying the velocity gradient technique (VGT) to the ^13 CO spectroscopic data from the GRS, FUGIN, and SEDIGSM surveys. Unlike dust-polarized emission, the VGT allows us to separate the foreground and background using the velocity information, from which the orientation of the magnetic field can be reliably determined. We find that in most cases the magnetic fields stay aligned with the filament bodies, which are parallel to the disk midplane. Among these, G29, G47, and G51 exhibit smooth magnetic fields, and G24, G339, and G349 exhibit discontinuities. The fact that most filaments have magnetic fields that stay aligned with the Galactic disk midplane suggests that Galactic shear may be responsible for shaping the filaments. The fact that the magnetic field can stay regular at the resolution of our analysis (≲10 pc), where the turbulence crossing time is short compared to the shear time, suggests that turbulent motion cannot effectively disrupt the regular orientation of the magnetic field. The discontinuities found in some filaments can be caused by processes including filament reassembly, gravitational collapse, and stellar feedback.https://doi.org/10.3847/1538-4357/ad09dfInterstellar mediumInterstellar magnetic fieldsInterstellar dynamics |
| spellingShingle | Mengke Zhao Guang-Xing Li Jianjun Zhou Xindi Tang Jarken Esimbek Yuxin He Dalei Li Weiguang Ji Zhengxue Chang Kadirya Tursun Magnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization Gaps The Astrophysical Journal Interstellar medium Interstellar magnetic fields Interstellar dynamics |
| title | Magnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization Gaps |
| title_full | Magnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization Gaps |
| title_fullStr | Magnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization Gaps |
| title_full_unstemmed | Magnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization Gaps |
| title_short | Magnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization Gaps |
| title_sort | magnetic fields in giant filaments probed by the velocity gradient technique regular magnetic field interrupted by magnetization gaps |
| topic | Interstellar medium Interstellar magnetic fields Interstellar dynamics |
| url | https://doi.org/10.3847/1538-4357/ad09df |
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