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Reconstructing the density and temperature structure of prestellar cores from $Herschel$ data: A case study for B68 and L1689B
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, 2014, 562, pp.A138. ⟨10.1051/0004-6361/201322236⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2014, 562, pp.A138. ⟨10.1051/0004-6361/201322236⟩, Astronomy and Astrophysics-A&A, 2014, 562, pp.id.A138. ⟨10.1051/0004-6361/201322236⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2014, 562, pp.id.A138. ⟨10.1051/0004-6361/201322236⟩
- Publication Year :
- 2014
- Publisher :
- HAL CCSD, 2014.
-
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<br />Comment: 10 pages, 7 figures, Accepted for publication to A&A
- Subjects :
- Opacity
Extinction (astronomy)
FOS: Physical sciences
F500
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Lambda
ISM: individual objects: B68
ISM: individual objects: L1689B
Radiative transfer
Astrophysics::Solar and Stellar Astrophysics
Continuum (set theory)
Astrophysics::Galaxy Astrophysics
QB
Physics
Line-of-sight
stars: formation
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
extinction
Drop (liquid)
Center (category theory)
Astronomy and Astrophysics
submillimeter: general
[PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Astrophysics - Astrophysics of Galaxies
13. Climate action
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Astrophysics::Earth and Planetary Astrophysics
dust
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Subjects
Details
- Language :
- English
- ISSN :
- 00046361 and 14320746
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, 2014, 562, pp.A138. ⟨10.1051/0004-6361/201322236⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2014, 562, pp.A138. ⟨10.1051/0004-6361/201322236⟩, Astronomy and Astrophysics-A&A, 2014, 562, pp.id.A138. ⟨10.1051/0004-6361/201322236⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2014, 562, pp.id.A138. ⟨10.1051/0004-6361/201322236⟩
- Accession number :
- edsair.doi.dedup.....2441391fc01cfef3198cc9be5bbf6ec0