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The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths toward the OMC-1 Region

Hwang, J; Kim, J; Pattle, K; Kwon, W; Sadavoy, S; Koch, PM; Hull, CLH; ... Bastien, P; + view all (2021) The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths toward the OMC-1 Region. The Astrophysical Journal , 913 (2) , Article 85. 10.3847/1538-4357/abf3c4. Green open access

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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 μm, and C18O (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.

Type: Article
Title: The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths toward the OMC-1 Region
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/abf3c4
Publisher version: http://dx.doi.org/10.3847/1538-4357/abf3c4
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: GOULD BELT SURVEY, REGULATED STAR-FORMATION, MOLECULAR CLOUDS, SCUBA-2 OBSERVATIONS, ZEEMAN OBSERVATIONS, LEGACY SURVEY, ORION-A, POLARIZATION, EVOLUTION, COLLAPSE
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10129387
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