Polarimetric mapping of Orion using MILLIPOL - Magnetic activity in BN/KL

Astronomy and Astrophysics – Astrophysics

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Interstellar Matter, Orion Nebula, Polarimetry, Cosmic Dust, Spatial Distribution, Stellar Magnetic Fields, Thermal Emission

Scientific paper

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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