The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths toward the OMC-1 Region
Jihye Hwang, Jongsoo Kim, Kate Pattle, Woojin Kwon, Sarah Sadavoy, Patrick M. Koch, Charles L. H. Hull, Doug Johnstone, Ray S. Furuya, Chang Won Lee, Doris Arzoumanian, Mehrnoosh Tahani, Chakali Eswaraiah, Tie Liu, Florian Kirchschlager, Kee-Tae Kim, Motohide Tamura, Jungmi Kwon, A-Ran Lyo, Archana Soam, Ji-hyun Kang, Tyler L. Bourke, Masafumi Matsumura, Steve Mairs, Gwanjeong Kim, Geumsook Park, Fumitaka Nakamura, Takashi Onaka, Xindi Tang, Hong-Li Liu, Derek Ward-Thompson, Di Li, Thiem Hoang, Tetsuo Hasegawa, Keping Qiu, Shih-Ping Lai, Pierre Bastien
Abstract
Abstract Measurement of magnetic field strengths in a molecular cloud is essential for determining the criticality of magnetic support against gravitational collapse. In this paper, as part of the JCMT BISTRO survey, we suggest a new application of the Davis–Chandrasekhar–Fermi (DCF) method to estimate the distribution of magnetic field strengths in the OMC-1 region. We use observations of dust polarization emission at 450 and 850 μ m, and C 18 O (3–2) spectral line data obtained with the JCMT. We estimate the volume density, the velocity dispersion, and the polarization angle dispersion in a box, 40″ × 40″ (5×5 pixels), which moves over the OMC-1 region. By substituting three quantities in each box with the DCF method, we get magnetic field strengths over the OMC-1 region. We note that there are very large uncertainties in the inferred field strengths, as discussed in detail in this paper. The field strengths vary from 0.8 to 26.4 mG, and their mean value is about 6 mG. Additionally, we obtain maps of the mass-to-flux ratio in units of a critical value and the Alfvén Mach number. The central parts of the BN–KL and South (S) clumps in the OMC-1 region are magnetically supercritical, so the magnetic field cannot support the clumps against gravitational collapse. However, the outer parts of the region are magnetically subcritical. The mean Alfvén Mach number is about 0.4 over the region, which implies that the magnetic pressure exceeds the turbulent pressure in the OMC-1 region.