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Alignment between Flattened Protostellar Infall Envelopes and Ambient Magnetic Fields

Chapman, Nicholas L. and Davidson, Jacqueline A. and Goldsmith, Paul F. and Houde, Martin and Kwon, Woojin and Li, Zhi-Yun and Looney, Leslie W. and Matthews, Brenda and Matthews, Tristan G. and Novak, Giles and Peng, Ruisheng and Vaillancourt, John E. and Volgenau, Nikolaus H. (2013) Alignment between Flattened Protostellar Infall Envelopes and Ambient Magnetic Fields. Astrophysical Journal, 770 (2). Art. No. 151. ISSN 0004-637X. doi:10.1088/0004-637X/770/2/151.

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We present 350 μm polarization observations of four low-mass cores containing Class 0 protostars: L483, L1157, L1448-IRS2, and Serp-FIR1. This is the second paper in a larger survey aimed at testing magnetically regulated models for core-collapse. One key prediction of these models is that the mean magnetic field in a core should be aligned with the symmetry axis (minor axis) of the flattened young stellar object inner envelope (aka pseudodisk). Furthermore, the field should exhibit a pinched or hourglass-shaped morphology as gravity drags the field inward toward the central protostar. We combine our results for the four cores with results for three similar cores that were published in the first paper from our survey. An analysis of the 350 μm polarization data for the seven cores yields evidence of a positive correlation between mean field direction and pseudodisk symmetry axis. Our rough estimate for the probability of obtaining by pure chance a correlation as strong as the one we found is about 5%. In addition, we combine together data for multiple cores to create a source-averaged magnetic field map having improved signal-to-noise ratio, and this map shows good agreement between mean field direction and pseudodisk axis (they are within 15°). We also see hints of a magnetic pinch in the source-averaged map. We conclude that core-scale magnetic fields appear to be strong enough to guide gas infall, as predicted by the magnetically regulated models. Finally, we find evidence of a positive correlation between core magnetic field direction and bipolar outflow axis.

Item Type:Article
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URLURL TypeDescription Paper
Goldsmith, Paul F.0000-0002-6622-8396
Novak, Giles0000-0003-1288-2656
Additional Information:© 2013 American Astronomical Society. Received 2013 February 12; accepted 2013 May 11; published 2013 June 6. We thank the anonymous referee for providing useful feedback that improved the statistical analysis in this paper. This material is based upon work at the Caltech Submillimeter Observatory, which is operated by the California Institute of Technology under cooperative agreement with the National Science Foundation (AST-0838261). This research was carried out in part at the Jet Propulsion Laboratory, which is operated by the California Institute of Technology under contract with NASA. We are grateful to the National Science Foundation for supporting the operation of SHARP via grant AST-0909030. N.L.C. is also supported under this grant.
Funding AgencyGrant Number
NSF Cooperative AgreementAST-0838261
Subject Keywords:ISM: jets and outflows; ISM: magnetic fields; stars: formation; techniques: polarimetric
Issue or Number:2
Record Number:CaltechAUTHORS:20130725-073139150
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Official Citation:Alignment between Flattened Protostellar Infall Envelopes and Ambient Magnetic Fields Nicholas L. Chapman, Jacqueline A. Davidson, Paul F. Goldsmith, Martin Houde, Woojin Kwon, Zhi-Yun Li, Leslie W. Looney, Brenda Matthews, Tristan G. Matthews, Giles Novak, Ruisheng Peng, John E. Vaillancourt, and Nikolaus H. Volgenau doi:10.1088/0004-637X/770/2/151
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39572
Deposited By: Ruth Sustaita
Deposited On:25 Jul 2013 14:49
Last Modified:09 Nov 2021 23:45

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