Twisting magnetic fields in the core region of OMC-1

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Abstract
We present results of imaging polarimetry of the |${\rm H}_2 v=1-0$| S(1) line in the core region of OMC-1. The polarization vectors are produced by dichroic absorption in a medium of aligned grains and therefore follow the direction of the magnetic field in the region. The magnetic field strength estimated from the dispersion of polarization vectors is |$\sim10 \ {\rm mG}$|⁠, which is sufficient to align the grains via the Davis–Greenstein mechanism. The presence of a twist in the direction of the magnetic field about the self-luminous object IRc2 is clearly seen. We propose a model which requires the magnetic field to be poloidal outside the disc of IRc2, but which develops a significant transverse component close to the disc.

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