Volume 434, Number 1, April IV 2005
|Page(s)||167 - 180|
|Section||Interstellar and circumstellar matter|
|Published online||01 April 2005|
3D continuum radiative transfer in complex dust configurations
II. 3D structure of the dense molecular cloud core Oph D
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany e-mail: [stein;henning;stickel]@mpia.de
2 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
3 Observatoire de Bordeaux, 2 rue de l'Observatoire, BP 89, 33270 Floirac, France e-mail: email@example.com
4 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: firstname.lastname@example.org
Accepted: 22 October 2004
Constraints on the density and thermal 3D structure of the dense molecular cloud core ρ Oph D are derived from a detailed 3D radiative transfer modeling. Two ISOCAM images at 7 and 15 μm are fitted simultaneously by representing the dust distribution in the core with a series of 3D Gaussian density profiles. Size, total density and position of the Gaussians are optimized by simulated annealing to obtain a 2D column density map. The projected core density has a complex elongated pattern with two peaks. We propose a new method to calculate an approximate temperature in an externally illuminated complex 3D structure from a mean optical depth. This “”-method is applied to a 1.3 mm map obtained with the IRAM 30m telescope to find the approximate 3D density and temperature distribution of the core ρ Oph D. The spatial 3D distribution deviates strongly from spherical symmetry. The elongated structure is in general agreement with recent gravo-turbulent collapse calculations for molecular clouds. We discuss possible ambiguities of the background determination procedure, errors of the maps, the accuracy of the -method and the influence of the assumed dust particle sizes and properties.
Key words: radiative transfer / stars: formation / infrared: stars / stars: circumstellar mater / methods: numerical / ISM: dust, extinction
© ESO, 2005
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