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2009MNRAS.398..394W - Mon. Not. R. Astron. Soc., 398, 394-400 (2009/September-1)
Optical and submillimetre observations of Bok globules - tracing the magnetic field from low to high density.
WARD-THOMPSON D., SEN A.K., KIRK J.M. and NUTTER D.
Abstract (from CDS):
It has previously been found that near-infrared polarization mapping of background stars does not accurately trace the magnetic field in dense cloud regions, and hence that the grains responsible for near-infrared polarization are under-represented in those regions. This may be due to a lack of aligned grains in dense regions. We test this by comparing the field orientations measured by our two independent methods of optical and submillimetre polarimetry. We find that the field orientation deduced from the optical data matches up well with the orientation estimated from the submillimetre data. We therefore claim that both methods are accurately tracing the same magnetic field in CB3. Hence, in this case, there must be significant numbers of aligned dust grains in the high-density region, and they do indeed trace the magnetic field in the submillimetre.
We find an offset of 40°±14° between the magnetic field orientation and the short axis of the globule. This is consistent with the mean value of 31°±3° found in our previous work on pre-stellar cores, even though CB3 is a protostellar core. CB246 is a pre-stellar core, and in this case the offset between the magnetic field orientation inferred from the optical polarization data and the short axis of the core inferred from the submillimetre continuum data is 28°±20°. Taken together, the six pre-stellar cores that we have now studied in this way show a mean offset between magnetic field orientation and core short axis of ∼30°±3°, in apparent contradiction with some models of magnetically dominated star formation.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): polarization - stars: formation - ISM: clouds - dust, extinction
Simbad objects: 10
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