Submillimeter Polarization Spectrum in the Vela C Molecular Cloud
  Polarization maps of the Vela C molecular cloud were obtained at 250, 350,
and 500um during the 2012 flight of the balloon-borne telescope BLASTPol. These
measurements are used in conjunction with 850um data from Planck to study the
submillimeter spectrum of the polarization fraction for this cloud. The
spectrum is relatively flat and does not exhibit a pronounced minimum at
\lambda ~350um as suggested by previous measurements of other molecular clouds.
The shape of the spectrum does not depend strongly on the radiative environment
of the dust, as quantified by the column density or the dust temperature
obtained from Herschel data. The polarization ratios observed in Vela C are
consistent with a model of a porous clumpy molecular cloud being uniformly
heated by the interstellar radiation field.
