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New Results on the Submillimeter Polarization Spectrum of the Orion Molecular Cloud

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John E. Vaillancourt1, C. Darren Dowell1,2, Roger H. Hildebrand3,4, Larry Kirby3, Megan M. Krejny5, Hua-bai Li6, Giles Novak5, Martin Houde7, Hiroko Shinnaga8 and Michael Attard7

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We have used the SHARP polarimeter at the Caltech Submillimeter Observatory to map the polarization at wavelengths of 350 and 450 μ m in a ~2' × 3' region of the Orion Molecular Cloud. The map covers the brightest region of the OMC-1 ridge including the Kleinmann-Low (KL) nebula and the submillimeter source Orion-south. The ratio of 450 to 350 μ m polarization is ~1.3 ± 0.3 in the outer parts of the cloud and drops by more than a factor of 2 toward KL. The outer cloud ratio is consistent with measurements in other clouds at similar wavelengths and confirms previous measurements placing the minimum of the polarization ratio in dusty molecular clouds at λ ~ 350 μ m .

Subject headings

dust, extinction; ISM: clouds; ISM: individual (OMC-1); polarization; submillimeter


Dates

Issue 1 (2008 May 20)

Received 2008 March 24, accepted for publication 2008 April 9

Published 2008 April 24



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