Abstract : Utilizing multiwavelength dust emission maps acquired with Herschel, we
reconstruct local volume density and dust temperature profiles for the prestellar cores
B68 and L1689B using an inverse-Abel transform-based technique. We present intrinsic
radial dust temperature profiles of starless cores directly from dust continuum emission
maps disentangling the effect of temperature variations along the line of sight, which
were previously limited to the radiative transfer calculations. The reconstructed dust
temperature profiles show a significant drop in the core center, a flat inner part, and a
rising outward trend until the background cloud temperature is reached. The central
beam-averaged dust temperatures obtained for B68 and L1689B are 9.3 ± 0.5 K and 9.8 ± 0.5 K, respectively, which are lower
than the temperatures of 11.3 K and 11.6 K obtained from direct SED fitting. The best mass
estimates derived by integrating the volume density profiles of B68 and L1689B are 1.6
M⊙ and 11 M⊙,
respectively. Comparing our results for B68 with the near-infrared extinction studies, we
find that the dust opacity law adopted by the HGBS project, κλ = 0.1 × (λ/300 μm)-2
cm2
g-1 agrees to
within 50% with the dust extinction constraints.
