Abstract
Magnetic fields play a significant role in star-forming processes on core to clump scales. We investigate magnetic field orientations and strengths in the massive star-forming clump P2 within the filamentary infrared dark cloud G28.34+0.06 using dust polarization observations made using SCUBA-2/POL-2 on the James Clerk Maxwell Telescope (JCMT) as part of the B-field In STar-forming Region Observations (or BISTRO) survey. We compare the magnetic field orientations at the clump scale of ∼2 pc from these JCMT observations with those at the core scale of ∼0.2 pc from archival Atacama Large Millimeter/submillimeter Array data, finding that the magnetic field orientations on these two different scales are perpendicular to one another. We estimate the distribution of magnetic field strengths, which range from 50 to 430 μG over the clump. The region forming the core shows the highest magnetic field strength. We also obtain the distribution of mass-to-flux ratios across the clump. In the region surrounding the core, the mass-to-flux ratio is larger than 1, which indicates that the magnetic field strength is insufficient to support the region against gravitational collapse. Therefore, the change in the magnetic field orientation from clump to core scales may be the result of gravitational collapse, with the field being pulled inward along with the flow of material under gravity.
| Original language | English |
|---|---|
| Article number | 222 |
| Journal | Astrophysical Journal |
| Volume | 985 |
| Issue number | 2 |
| Early online date | 27 May 2025 |
| DOIs | |
| Publication status | Published - 1 Jun 2025 |
Acknowledgements
The JCMT is operated by the East Asian Observatory on behalf of the National Astronomical Observatory of Japan; Academia Sinica Institute of Astronomy and Astrophysics; the Korea Astronomy and Space Science Institute; and the Operation, Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments, budgeted from the Ministry of Finance of China. Additional funding support is provided by the Science and Technology Facilities Council of the United Kingdom and participating universities and organizations in the United Kingdom, Canada, and Ireland. Additional funds for the construction of SCUBA-2 were provided by the Canada Foundation for Innovation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.Funding
K.P. is a Royal Society University Research Fellow, supported by grant No. URF\R1\211322. C.W.L. is supported by the Basic Science Research Program through the NRF funded by the Ministry of Education, Science and Technology (grant No. NRF-2019R1A2C1010851) and by the Korea Astronomy and Space Science Institute grant funded by the Korea government (MSIT; project No. 2024-1-841-00). K.Q. acknowledges National Natural Science Foundation of China (NSFC; grant Nos. 12425304 and U1731237), and the National Key R&D Program of China (grant Nos. 2023YFA1608204 and 2022YFA1603103). E.S. acknowledges the support of a Alliance of International Science Organization (ANSO; grant No. ANSO/VF/2021/01) grant for this work. F.P. acknowledges support from the Spanish Ministerio de Ciencia, Innovación y Universidades (MICINN) under grant No. PID2022-141915NB-C21. D.J. is supported by NRC Canada and by an NSERC Discovery Grant. M.T. is supported by the Banting Fellowship (Natural Sciences and Engineering Research Council Canada) hosted at Stanford University and the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC) Fellowship. J.K. is supported by the Royal Society under grant No. RF\ERE\231132, as part of project URF\R1\211322. N.B.N. was funded by the Vingroup Innovation Foundation (VINIF) under project code VINIF.2023.DA.057. T.M.T. is supported by JSPS KAKENHI grant No. 24H00242. J.K. is supported by JSPS KAKENHI grant No. 24K07086. E.C. acknowledges the support from a Core Research Grant (CRG; sanction order number CRG/2023/008710) awarded by the Anusandhan National Research Foundation (ANRF) under Science and Engineering Research Board (SERB), Govt. of India. T.L. acknowledges the supports by the National Key R&D Program of China (grant No. 2022YFA1603100), NSFC through grants Nos. 12073061 and 12122307, and the Tianchi Talent Program of Xinjiang Uygur Autonomous Region. R.S.F. was supported by the Visiting Scholars Program provided by the NAOJ Research Coordination Committee, NINS (NAOJ-RCC-23DS-050). S.P.L. acknowledges grants from the National Science and Technology Council of Taiwan under project numbers 112-2112-M-007-011 and 113-2112-M-007-004. W.K. is supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT; grant No. RS-2024-00342488).
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science