Title:  Magnetic Fields in Star-Forming Molecular Clouds: 
        Ongoing Results from SCUBA Polarimetry

Brenda Matthews
University of California, Berkely

Abstract:
   
It has long been hoped that far-infrared - millimeter polarimetry could
provide the "smoking gun" to studies of magnetic field geometries by
tracing two of the three dimensions of the field within dense molecular
cloud interiors.  In my talk, I will present some of my recently published
results, including some qualitative models deduced for filamentary
molecular clouds.  I will show that, in some cases, the models can closely
predict the behavior of the polarization pattern, but that, as yet, the
models are degenerate, i.e., more than one model can produce a given
polarization pattern.  However, these data do show strong evidence for
dust grain alignment within a variety of clouds, and they are effective at
eliminating some magnetic field geometries, including a unidirectional
field.  In addition to the filamentary cloud data, I will include data on
the Barnard 1 and NGC 1333 dark clouds in Perseus.  In Barnard 1, four
cores exhibit different polarization position angles, and one does not
show the commonly seen depolarization effect.