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Polarimetric mapping of Orion using MILLIPOL - Magnetic activity in BN/KL
Leach, Robert W.; Clemens, Dan P.; Kane, Brian D.; Barvainis, Richard
AA(San Diego State University, CA), AB(Boston University, MA), AC(Boston University, MA), AD(Haystack Observatory, Westford, MA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 370, March 20, 1991, p. 257-262. Research supported by Boston University and Flynn Foundation. (ApJ Homepage)
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NASA/STI Keywords:
Interstellar Matter, Orion Nebula, Polarimetry, Cosmic Dust, Spatial Distribution, Stellar Magnetic Fields, Thermal Emission
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The spatial distribution of the polarized component of the thermal dust emission from the core of the Orion molecular cloud has been mapped over 15 positions at a wavelength of 1300 microns using the Millipol instrument on the NRAO 12 m telescope. The polarization directions deduced for the map positions are quite similar, implying that the embedded magnetic field is strong (of the order of 1 mG) and uniform in direction over the core of the cloud. The mean polarization percentage, 4.6 percent, is quite high, and two positions show polarization percentages of nearly 8 percent, the highest yet detected for polarized thermal dust emission. Finally, the polarization of the BN/KL position was found to be significantly lower than the polarizations toward positions 30 arcmin outside BN/KL.

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