Radiative transfer models of non-spherical prestellar cores
16 pages, 22 figures, accepted by A&A, also available (with high resolution figures) at http://www.astro.cf.ac.uk/pub/Dimitrios.Stamatellos/publications/ We present 2D Monte Carlo radiative transfer simulations of prestellar cores. We consider two types of asymmetry: disk-like asymmetry, in whic...
Main Authors: | , , , |
---|---|
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2004
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00009363 https://doi.org/10.1051/0004-6361:20034546 |
id |
ftccsdartic:oai:HAL:hal-00009363v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-00009363v1 2023-05-15T18:23:02+02:00 Radiative transfer models of non-spherical prestellar cores Stamatellos, D. Whitworth, A. P. Andre, P. Ward-Thompson, D. Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA) Commissariat à l'énergie atomique et aux énergies alternatives (CEA) 2004 https://hal.archives-ouvertes.fr/hal-00009363 https://doi.org/10.1051/0004-6361:20034546 en eng HAL CCSD EDP Sciences info:eu-repo/semantics/altIdentifier/arxiv/astro-ph/0404443 info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20034546 hal-00009363 https://hal.archives-ouvertes.fr/hal-00009363 ARXIV: astro-ph/0404443 doi:10.1051/0004-6361:20034546 ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.archives-ouvertes.fr/hal-00009363 Astronomy and Astrophysics - A&A, EDP Sciences, 2004, 420, pp.1009-1023. ⟨10.1051/0004-6361:20034546⟩ [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] info:eu-repo/semantics/article Journal articles 2004 ftccsdartic https://doi.org/10.1051/0004-6361:20034546 2020-12-26T21:53:17Z 16 pages, 22 figures, accepted by A&A, also available (with high resolution figures) at http://www.astro.cf.ac.uk/pub/Dimitrios.Stamatellos/publications/ We present 2D Monte Carlo radiative transfer simulations of prestellar cores. We consider two types of asymmetry: disk-like asymmetry, in which the core is denser towards the equatorial plane than towards the poles; and axial asymmetry, in which the core is denser towards the south pole than the north pole. We limit our treatment to cores with mild asymmetries, which are exposed directly to the interstellar radiation field or are embedded inside molecular clouds. The isophotal maps of a core depend strongly on the viewing angle. Maps at wavelengths longer than the peak of the SED (e.g. 850 micron) essentially trace the column-density. Thus, for instance, cores with disk-like asymmetry appear elongated when mapped at 850 micron from close to the equatorial plane. However, at wavelengths near the peak of the SED (e.g. 200 micron), the emissivity is more strongly dependent on the temperature, and therefore, at particular viewing angles, there are characteristic features which reflect a more complicated convolution of the density and temperature fields within the core. These characteristic features are on scales 1/5 to 1/3 of the overall core size, and so high resolution observations are needed to observe them. They are also weaker if the core is embedded in a molecular cloud (because the range of temperature within the core is then smaller), and so high sensitivity is needed to detect them. Herschel, to be launched in 2007, will in principle provide the necessary resolution and sensitivity at 170 to 250 micron. Article in Journal/Newspaper South pole Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) North Pole South Pole |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] |
spellingShingle |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] Stamatellos, D. Whitworth, A. P. Andre, P. Ward-Thompson, D. Radiative transfer models of non-spherical prestellar cores |
topic_facet |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] |
description |
16 pages, 22 figures, accepted by A&A, also available (with high resolution figures) at http://www.astro.cf.ac.uk/pub/Dimitrios.Stamatellos/publications/ We present 2D Monte Carlo radiative transfer simulations of prestellar cores. We consider two types of asymmetry: disk-like asymmetry, in which the core is denser towards the equatorial plane than towards the poles; and axial asymmetry, in which the core is denser towards the south pole than the north pole. We limit our treatment to cores with mild asymmetries, which are exposed directly to the interstellar radiation field or are embedded inside molecular clouds. The isophotal maps of a core depend strongly on the viewing angle. Maps at wavelengths longer than the peak of the SED (e.g. 850 micron) essentially trace the column-density. Thus, for instance, cores with disk-like asymmetry appear elongated when mapped at 850 micron from close to the equatorial plane. However, at wavelengths near the peak of the SED (e.g. 200 micron), the emissivity is more strongly dependent on the temperature, and therefore, at particular viewing angles, there are characteristic features which reflect a more complicated convolution of the density and temperature fields within the core. These characteristic features are on scales 1/5 to 1/3 of the overall core size, and so high resolution observations are needed to observe them. They are also weaker if the core is embedded in a molecular cloud (because the range of temperature within the core is then smaller), and so high sensitivity is needed to detect them. Herschel, to be launched in 2007, will in principle provide the necessary resolution and sensitivity at 170 to 250 micron. |
author2 |
Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA) Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
format |
Article in Journal/Newspaper |
author |
Stamatellos, D. Whitworth, A. P. Andre, P. Ward-Thompson, D. |
author_facet |
Stamatellos, D. Whitworth, A. P. Andre, P. Ward-Thompson, D. |
author_sort |
Stamatellos, D. |
title |
Radiative transfer models of non-spherical prestellar cores |
title_short |
Radiative transfer models of non-spherical prestellar cores |
title_full |
Radiative transfer models of non-spherical prestellar cores |
title_fullStr |
Radiative transfer models of non-spherical prestellar cores |
title_full_unstemmed |
Radiative transfer models of non-spherical prestellar cores |
title_sort |
radiative transfer models of non-spherical prestellar cores |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.archives-ouvertes.fr/hal-00009363 https://doi.org/10.1051/0004-6361:20034546 |
geographic |
North Pole South Pole |
geographic_facet |
North Pole South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.archives-ouvertes.fr/hal-00009363 Astronomy and Astrophysics - A&A, EDP Sciences, 2004, 420, pp.1009-1023. ⟨10.1051/0004-6361:20034546⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/astro-ph/0404443 info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20034546 hal-00009363 https://hal.archives-ouvertes.fr/hal-00009363 ARXIV: astro-ph/0404443 doi:10.1051/0004-6361:20034546 |
op_doi |
https://doi.org/10.1051/0004-6361:20034546 |
_version_ |
1766202465322008576 |