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The JCMT BISTRO Survey: The Magnetic Field Strength in the Orion A Filament
Pattle, Kate,Ward-Thompson, Derek,Berry, David,Hatchell, Jennifer,Chen, Huei-Ru,Pon, Andy,Koch, Patrick M.,Kwon, Woojin,Kim, Jongsoo,Bastien, Pierre,Cho, Jungyeon,Coudé,, Simon,Di Francesco, Jam American Astronomical Society 2017 The Astrophysical journal Vol.846 No.2
<P>We determine the magnetic field strength in the OMC. 1 region of the Orion A filament via a new implementation of the Chandrasekhar-Fermi method using observations performed as part of the James Clerk Maxwell Telescope (JCMT) B-Fields In Star-forming Region Observations (BISTRO) survey with the POL-2 instrument. We combine BISTRO data with archival SCUBA-2 and HARP observations to find a plane-of-sky magnetic field strength in OMC. 1 of B-pos= 6.6 +/- 4.7 mG, where delta B-pos = 4.7 mG represents a predominantly systematic uncertainty. We develop a new method for measuring angular dispersion, analogous to unsharp masking. We find a magnetic energy density of similar to 1.7 x 10(-7) J m(-3) in OMC. 1, comparable both to the gravitational potential energy density of OMC 1 (similar to 10(-7) J m(-3)) and to the energy density in the Orion BN/KL outflow (similar to 10(-7) J m(-3)). We find that neither the Alfven velocity in OMC. 1 nor the velocity of the super-Alfvenic outflow ejecta is sufficiently large for the BN/KL outflow to have caused large-scale distortion of the local magnetic field in the similar to 500 yr lifetime of the outflow. Hence, we propose that the hourglass field morphology in OMC. 1 is caused by the distortion of a primordial cylindrically symmetric magnetic field by the gravitational fragmentation of the filament and/or the gravitational interaction of the BN/KL and S clumps. We find that OMC. 1 is currently in or near magnetically supported equilibrium, and that the current large-scale morphology of the BN/KL outflow is regulated by the geometry of the magnetic field in OMC 1, and not vice versa.</P>
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First Results from BISTRO: A SCUBA-2 Polarimeter Survey of the Gould Belt
Ward-Thompson, Derek,Pattle, Kate,Bastien, Pierre,Furuya, Ray S.,Kwon, Woojin,Lai, Shih-Ping,Qiu, Keping,Berry, David,Choi, Minho,Coudé,, Simon,Francesco, James Di,Hoang, Thiem,Franzmann, Erica American Astronomical Society 2017 The Astrophysical Journal Vol.842 No.1
<P>We present the first results from the B-fields In STar-forming Region Observations (BISTRO) survey, using the Sub-millimetre Common-User Bolometer Array. 2 camera, with its associated polarimeter (POL-2), on the James Clerk Maxwell Telescope in Hawaii. We discuss the survey's aims and objectives. We describe the rationale behind the survey, and the questions that. the survey will aim to answer. The most important of these is the role of magnetic fields in the star formation process on the scale of individual filaments and cores in dense regions. We describe the data acquisition and reduction processes for POL-2, demonstrating both repeatability and consistency with previous data. We present a first-look analysis of the first results from the BISTRO survey in the OMC 1 region. We see that the magnetic field lies approximately perpendicular to the famous 'integral filament' in the densest regions of that filament. Furthermore, we see an 'hourglass' magnetic field morphology extending beyond the densest region of the integral filament into the less-dense surrounding material, and discuss possible causes for this. We also discuss the more complex morphology seen along the Orion Bar region. We examine the morphology of the field along the lower-density northeastern filament. We find consistency with previous theoretical models that predict magnetic fields lying parallel to low-density, non-self-gravitating filaments, and perpendicular to higher-density, self-gravitating filaments.</P>
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