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Magnetic Fields and Infall Motions in NGC 1333 IRAS 4

Attard, Michael and Houde, Martin and Novak, Giles and Li, Hua-Bai and Vaillancourt, John E. and Dowell, C. Darren and Davidson, Jacqueline and Shinnaga, Hiroko (2009) Magnetic Fields and Infall Motions in NGC 1333 IRAS 4. Astrophysical Journal, 702 (2). pp. 1584-1592. ISSN 0004-637X.

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We present single-dish 350 μm dust continuum polarimetry as well as HCN and HCO^+ J = 4 → 3 rotational emission spectra obtained on NGC 1333 IRAS 4. The polarimetry indicates a uniform field morphology over a 20" radius from the peak continuum flux of IRAS 4A, in agreement with models of magnetically supported cloud collapse. The field morphology around IRAS 4B appears to be quite distinct, however, with indications of depolarization observed toward the peak flux of this source. Inverse P Cygni profiles are observed in the HCN J = 4 → 3 line spectra toward IRAS 4A, providing a clear indication of infall gas motions. Taken together, the evidence gathered here appears to support the scenario that IRAS 4A is a cloud core in a critical state of support against gravitational collapse.

Item Type:Article
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Novak, Giles0000-0003-1288-2656
Additional Information:© 2009. The American Astronomical Society. Received 2009 May 4; accepted 2009 July 8; published 2009 August 24. Our group is grateful for the assistance of the Caltech Submillimeter Observatory staff in installing and observing with SHARP and the heterodyne receiver. We also acknowledge the help provided by Jose Girart,Megan Krejny, Roger Hildebrand, Tristan Matthews, Larry Kirby, and Lerothodi Leeuw. M.A.’s and M.H.’s research is funded through the NSERC Discovery Grant, Canada Research Chair, Canada Foundation for Innovation, Ontario Innovation Trust, andWestern’s Academic Development Fund programs. SHARC II is funded through the NSF grant AST 05-40882 to the California Institute of Technology. The development of SHARP was funded by an NSF grant to Northwestern University (AST 02-43156), and its subsequent commissioning was funded by NSF grants to Northwestern University (AST 05-05230) and University of Chicago (AST 05-05124).
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council (NSERC) of CanadaUNSPECIFIED
Canada Research ChairUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Innovation TrustUNSPECIFIED
University of Western OntarioUNSPECIFIED
NSFAST 05-40882
NSFAST 02-43156
NSFAST 05-05230
NSFAST 05-05124
Subject Keywords:ISM: individual (NGC 1333 IRAS 4); ISM: magnetic fields; ISM: molecules; polarization; stars: formation; submillimeter
Issue or Number:2
Record Number:CaltechAUTHORS:20090918-074011552
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Official Citation:Magnetic Fields and Infall Motions in NGC 1333 IRAS 4 Michael Attard, Martin Houde, Giles Novak, Hua-bai Li, John E. Vaillancourt, C. Darren Dowell, Jacqueline Davidson, and Hiroko Shinnaga 2009 ApJ 702 1584-1592 doi: 10.1088/0004-637X/702/2/1584
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15941
Deposited By: Ruth Sustaita
Deposited On:21 Sep 2009 22:41
Last Modified:09 Mar 2020 13:19

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