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

2 FORMATION STELLAIRE 2014
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
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 $\pm$ 0.5 K and 9.8 $\pm$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_sol and 11 M_sol, respectively. Comparing our results for B68 with the near-infrared extinction studies, we find that the dust opacity law adopted by the HGBS project, $\kappa_{\lambda} =0.1(\lambda/300 \mu m)^{-2}$, agrees to within 50% with the dust extinction constraints
Type de document :
Article dans une revue
Astronomy and Astrophysics - A&A, EDP Sciences, 2014, 562, pp.id.A138. <10.1051/0004-6361/201322236>
Domaine :

https://hal.archives-ouvertes.fr/hal-00907608
Contributeur : Marie-Paule Pomies <>
Soumis le : jeudi 21 novembre 2013 - 14:51:25
Dernière modification le : mercredi 4 janvier 2017 - 16:19:37

### Citation

A. Roy, Philippe André, P. Palmeirim, M. Attard, V. Konyves, et al.. Reconstructing the density and temperature structure of prestellar cores from $Herschel$ data: A case study for B68 and L1689B. Astronomy and Astrophysics - A&A, EDP Sciences, 2014, 562, pp.id.A138. <10.1051/0004-6361/201322236>. <hal-00907608>

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