AustralieFrV1, Main, Exploration, bibRecord, 006371

Observations and radiative transfer modelling of a massive dense cold core in G333

Identifieur interne : 006371 ( Main/Exploration ); précédent : 006370; suivant : 006372

Observations and radiative transfer modelling of a massive dense cold core in G333

Auteurs : N. Lo [Chili, Australie, France] ; M. P. Redman [Irlande (pays)] ; P. A. Jones [Chili, Australie] ; M. R. Cunningham [Australie] ; R. Chhetri [Australie] ; I. Bains [Australie] ; M. G. Burton [Australie]

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011-07-21.

RBID : ISTEX:38DFC88FE252D2F5186D282CF854BAAB2AA20600

Descripteurs français

Pascal (Inist)
- Abondance, Cinématique, Continuum, Dynamique, Ecoulement moléculaire, Formation stellaire, Grain poussière, Jet, Masse stellaire, Modèle, Profil raie, Transfert radiatif.

English descriptors

Abstract

Cold massive cores are one of the earliest manifestations of high‐mass star formation. Following the detection of SiO emission from G333.125−0.562, a cold massive core, further investigations of the physics, chemistry and dynamics of this object has been carried out. Mopra and NANTEN2 molecular line profile observations, Australia Telescope Compact Array (ATCA) line and continuum emission maps and Spitzer 24 and 70 μm images were obtained. These new data further constrain the properties of this prime example of the very early stages of high‐mass star formation. A model for the source was constructed and compared directly with the molecular line data using a 3D molecular line transfer code –mollie. The ATCA data reveal that G333.125−0.562 is composed of two sources. One of the source is responsible for the previously detected molecular outflow and is detected in the Spitzer 24 and 70 μm band data. Turbulent velocity widths are lower than other more active regions of G333 which reflects the younger evolutionary stage and/or lower mass of this core. The molecular line modelling requires abundances of the CO isotopes that strongly imply heavy depletion due to freeze‐out of this species on to dust grains. The principal cloud is cold, moderately turbulent and possesses an outflow which indicates the presence of a central driving source. The secondary source could be an even less evolved object as no apparent associations with continuum emissions at (far‐)infrared wavelengths.

Url:

https://api.istex.fr/document/38DFC88FE252D2F5186D282CF854BAAB2AA20600/fulltext/pdf

DOI: 10.1111/j.1365-2966.2011.18726.x

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Cold massive cores are one of the earliest manifestations of high‐mass star formation. Following the detection of SiO emission from G333.125−0.562, a cold massive core, further investigations of the physics, chemistry and dynamics of this object has been carried out. Mopra and NANTEN2 molecular line profile observations, Australia Telescope Compact Array (ATCA) line and continuum emission maps and Spitzer 24 and 70 μm images were obtained. These new data further constrain the properties of this prime example of the very early stages of high‐mass star formation. A model for the source was constructed and compared directly with the molecular line data using a 3D molecular line transfer code –mollie. The ATCA data reveal that G333.125−0.562 is composed of two sources. One of the source is responsible for the previously detected molecular outflow and is detected in the Spitzer 24 and 70 μm band data. Turbulent velocity widths are lower than other more active regions of G333 which reflects the younger evolutionary stage and/or lower mass of this core. The molecular line modelling requires abundances of the CO isotopes that strongly imply heavy depletion due to freeze‐out of this species on to dust grains. The principal cloud is cold, moderately turbulent and possesses an outflow which indicates the presence of a central driving source. The secondary source could be an even less evolved object as no apparent associations with continuum emissions at (far‐)infrared wavelengths.</div>
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Serveur d'exploration sur les relations entre la France et l'Australie

Observations and radiative transfer modelling of a massive dense cold core in G333

Observations and radiative transfer modelling of a massive dense cold core in G333

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English descriptors

Abstract

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