Submillimetre polarimetric observations of magnetic fields in star-forming regions

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Proceedings titleStar-Disk Interaction in Young Stars
Series titleProceedings of the International Astronomical Union; Volume 3
ConferenceIAU Symposium 243, May 21-25, 2007, Grenoble, France
Pages6370; # of pages: 8
Subjecttechniques: polarimetric; submillimetre; stars: formation; stars: magnetic fields
AbstractSubmillimetre imaging polarimetry is one of the most powerful tools at present for studying magnetic fields in star-forming regions, and the only way to gain significant information on the structure of these fields. We present analysis of the largest sample (to date) of both high- and low-mass star-forming regions observed using this technique. A variety of magnetic field morphologies are observed, with no single field morphology favoured. Both the continuum emission morphologies and the field morphologies are generally more complex for the high-mass sample than the low-mass sample. The large scale magnetic field (observed with the JCMT; 14" resolution) of NGC1333 IRAS2 is interpreted to be weak (compared to the energetic contributions due to turbulence) from the random field pattern observed. On smaller scales (observed with the BIMA array; 3" resolution) the field is observed to be almost radial, consistent with the polarisation nulls in the JCMT data – suggesting that on smaller scales, the field may be more important to the star formation process. An analysis of the magnetic field direction and the jet/outflow axis is also discussed. Cumulative distribution functions of the difference between the mean position angle of the magnetic field vectors and the jet/outflow axis reveal no correlation. However, visual inspection of the maps reveal alignment of the magnetic field and jet/outflow axis in 7 out of 15 high-mass regions and 3 out of 8 low-mass regions.
Publication date
PublisherInternational Astronomical Union
AffiliationNRC Herzberg Institute of Astrophysics; National Research Council Canada
Peer reviewedYes
NPARC number13053028
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Record identifier08184d07-b729-4849-a2ff-44fb3d041df0
Record created2009-11-25
Record modified2017-06-27
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