Journal Article

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

N. Lo, M. P. Redman, P. A. Jones, M. R. Cunningham, R. Chhetri, I. Bains and M. G. Burton

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 1, pages 525-533
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18726.x
Observations and radiative transfer modelling of a massive dense cold core in G333

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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.

Keywords: radiative transfer; stars: formation; ISM: individual objects: G333.125−0.562; ISM: jets and outflows; ISM: kinematics and dynamics

Journal Article.  4806 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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