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Mid- and far-infrared polarimetric studies of the core of OMC-1: the inner field configuration

Aitken, DK, Smith, CH, Moore, TJT, Roche, PF, Fujiyoshi, T and Wright, CM (1997) Mid- and far-infrared polarimetric studies of the core of OMC-1: the inner field configuration. Monthly Notices of the Royal Astronomical Society, 286 (1). pp. 85-96. ISSN 0035-8711

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Abstract

We present imaging polarimetry of the central 30 arcsec of OMC-1 at 12.5 and 17 μm with arcsecond resolution, together with complementary spectropolarimetry in the ranges 8–13 and 16–22 μ ;m at selected positions, and polarimetry at 800 μm over an approximately 1-arcmin field.

The polarization is due to the dichroism of aligned grains in emission in the farinfrared, and predominantly due to absorption in the mid-infrared. The images reveal large variations of polarization fraction and position angle in BNKL, the central region, and these can explain the low fractional polarization observed when this region is unresolved, as in the far-infrared. The mid-infrared polarization indicates that a substantial component of magnetic field is aligned with the plane of the disc-like structures inferred from millimetre-wave studies, and suggests the presence of a toroidal field within the disc.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 1997 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 06 Mar 2018 12:22
Last Modified: 06 Mar 2018 12:22
DOI or Identification number: 10.1093/mnras/286.1.85
URI: http://researchonline.ljmu.ac.uk/id/eprint/8196

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