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

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 \mum 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 sources is responsible for the previously detected molecular outflow and is detected in the Spitzer 24 and 70 \mum 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 onto 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.

10 pages, accepted to MNRAS

References in corpus (7)

• Theory of Star Formation
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - III. Multi-molecular line mapping
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - II. Column density and dynamical state of the clumps
• Millimetre Continuum Observations of Southern Massive Star Formation Regions II. SCUBA observations of cold cores and the dust grain emissivity index $\beta$
• Detection of SiO emission from a massive dense cold core
• CO abundances in a protostellar cloud: freeze-out and desorption in the envelope and outflow of L483
• Search for synchrotron emission from secondary leptons in dense cold starless cores

Cited by in corpus (8)

• Mapping Large-Scale CO Depletion in a Filamentary Infrared Dark Cloud
• Mopra CO Observations of the Bubble HII Region RCW120
• The Three-mm Ultimate Mopra Milky Way Survey. II. Cloud and Star Formation Near the Filamentary Ministarburst RCW 106
• A Spitzer Space Telescope survey of massive young stellar objects in the G333.2-0.4 giant molecular cloud
• Infall, outflow, and turbulence in massive star-forming cores in the G333 giant molecular cloud
• Scaled up low-mass star formation in massive star-forming cores in the G333 giant molecular cloud
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - IV. Ammonia towards dust emission
• Pilot Observations for MALT-45: A Galactic Plane Survey at 7mm