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New results on the submillimeter polarization spectrum of the Orion Molecular Cloud

Vaillancourt, John E. and Dowell, C. Darren and Hildebrand, Roger H. and Kirby, Larry and Krejny, Megan M. and Li, Hua-bai and Novak, Giles and Houde, Martin and Shinnaga, Hiroko and Attard, Michael (2008) New results on the submillimeter polarization spectrum of the Orion Molecular Cloud. Astrophysical Journal Letters, 679 (1). L25-L28. ISSN 2041-8205.

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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 μm 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 μm 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 μm .

Item Type:Article
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URLURL TypeDescription
Novak, Giles0000-0003-1288-2656
Additional Information:© 2008 The American Astronomical Society. Received 2008 March 24; accepted 2008 April 9; published 2008 April 24. We are grateful for the help of the Caltech Submillimeter Observatory (CSO) staff in installing and observing with SHARP and SHARC-II. Also thanks to Jackie Davidson, and Emeric Le Floc’h for observing assistance. SHARP has been supported by NSF grants AST 02-41356, AST 05-05230, and AST 05-05124. The CSO is supported by the NSF through grant AST 05-40882. Facilities: CSO(SHARC2).
Funding AgencyGrant Number
NSFAST 02-41356
NSFAST 05-05230
NSFAST 05-05124
NSFAST 05-40882
Subject Keywords:dust, extinction; ISM : clouds; ISM : individual (OMC-1); polarization; submillimeter
Issue or Number:1
Record Number:CaltechAUTHORS:20090506-133425947
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14166
Deposited By: Tony Diaz
Deposited On:11 May 2009 18:06
Last Modified:09 Mar 2020 13:19

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