Physics
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt.........6s&link_type=abstract
Thesis (PHD). THE UNIVERSITY OF CHICAGO , Source DAI-B 58/04, p. 1927, Oct 1997, 74 pages.
Physics
1
Scientific paper
We present polarization maps of the Orion molecular cloud (OMC-1) at far-infrared (100 μm) and submillimeter (350 μm) wavelengths. The polarization (0-8%) decreases radially towards the submillimeter flux peak, KL, a region of OB star formation. The maximum polarization decreases with optical depth and temperature. At KL the polarization increases with wavelength, due to the opacity of dust (τ100μ m=0.6). Far-infrared flux peaks surrounding the M42 nebula have low polarization, which we attribute to a magnetic field that is bulging around the HII region towards the line of sight. The far-infrared and submillimeter polarization is perpendicular to optical polarization in nearby regions, consistent with a mean direction for the magnetic field of 120o (east of north). Within OMC-1, the polarization angles show an hourglass distortion of the magnetic field. The hourglass is characterized by a symmetrical distortion at scales less than 1/2 pc, a uniform field at scales less than 0.1 pc, and a centroid that is 45'' south-west of KL on the OMC-1 ridge. We use the hourglass morphology to connect the magnetic field in the KL core to the surrounding ambient envelope. We estimate that the magnetic, kinetic, and gravitational energies are in equipartition in the KL core, but are magnetically dominated in the ambient envelope. We discuss a model in which the high mass stars in OMC-1 formed out of a cloud that was initially supported by the magnetic field.
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