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

Roy, A., André, Ph., Palmeirim, P., Attard, M., Könyves, V., Schneider, N., Peretto, Nicolas, Men’shchikov, A., Ward-Thompson, Derek, Kirk, J., Griffin, Matthew Joseph, Marsh, Kenneth, Abergel, A., Arzoumanian, D., Benedettini, M., Hill, T., Motte, F., Nguyen Luong, Q., Pezzuto, S., Rivera-Ingraham, A., Roussel, H., Rygl, K. L. J., Spinoglio, L., 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 and Astrophysics 562 , A138. 10.1051/0004-6361/201322236

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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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: stars: formation – submillimeter: general – ISM: individual objects: B68 – ISM: individual objects: L1689B – dust, extinction
Publisher: EDP Sciences
ISSN: 0004-6361
Funders: STFC
Date of First Compliant Deposit: 26 April 2017
Last Modified: 16 Jul 2019 21:54
URI: http://orca-mwe.cf.ac.uk/id/eprint/58736

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