Reconstructing the density and temperature structure of prestellar cores from Herschel data : A case study for B68 and L1689B

Roy, A. and André, Ph. and Palmeirim, P. and Attard, M. and Könyves, Vera and Schneider, N. and Peretto, N. and Men'shchikov, A. and Ward-Thompson, D. and Kirk, J. and Griffin, M. and Marsh, K. and Abergel, A. and Arzoumanian, D. and Benedettini, M. and Hill, T. and Motte, F. and Nguyen, Luong Q. and Pezzuto, S. and Rivera-Ingraham, A. and Roussel, H. and Rygl, K. L. J. and Spinoglio, L. and Stamatellos, D. and White, G. (2014) Reconstructing the density and temperature structure of prestellar cores from Herschel data : A case study for B68 and L1689B. ASTRONOMY & ASTROPHYSICS, 562. ISSN 0004-6361

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Abstract

Utilizing multi-wavelength dust emission maps acquired with Herschel, we reconstruct local volume density and dust temperature profiles for the prestellar cores B68 and L1689B using 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 was previously limited to the radiative transfer calculations. The reconstructed dust temperature profiles show a significant drop in 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.

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