Physics – Optics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21536905n&link_type=abstract
American Astronomical Society, AAS Meeting #215, #369.05; Bulletin of the American Astronomical Society, Vol. 42, p.560
Physics
Optics
Scientific paper
SHARP is a fore-optics module that adds polarimetric capability to the SHARC-II camera at the Caltech Submillimeter Observatory (CSO). We start with a discussion of SHARP's first result for low-mass protostellar cores: our magnetic field map of the NGC 1333 IRAS 4 region, published by M. Attard and collaborators. NGC 1333 IRAS 4 includes the low-mass protostellar cores IRAS 4A and IRAS 4B, and our SHARP map can be compared with the interferometric polarimetry map for IRAS 4A that was obtained by J. M. Girart and collaborators using the SubMillimeter Array. The SMA polarimetry revealed a pinch-like magnetic field structure in this Class 0 protobinary (500 A.U. separation) suggesting an hourglass field morphology for this core. The SHARP map covers more sky area but with coarser angular resolution, and reveals an ordered magnetic field running approximately parallel to the axis of the SMA pinch. No pinched field lines are seen in the SHARP data. The near-coincidence of the SHARP and SMA magnetic axes provides further evidence in support of the hourglass field morphology, while the lack of pinching on the larger scales indicates that the extent of the pinched-field region is less than about 3000 A.U. Evidence for gas infall in NGC 1333 IRAS 4A is obtained from spectral line mapping. We compare this velocity information and the data on magnetic fields with the predictions of models for magnetically-regulated protostellar collapse. Following our discussion of NGC 1333, we describe our planned survey of 13 relatively nearby, relatively isolated cores containing Class 0 protostars (or protobinaries of separation less than 80 A.U.) driving collimated outflows. Our goals are to search for evidence of hourglass fields and for correlations between outflow axes and core magnetic field directions.
Attard Michael
Chapman Neil
Davidson Jacqueline A.
Dowell Charles (Darren)
Goldsmith Paul F.
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