Detection of SiO emission from a massive dense cold core

Abstract

We report the detection of the SiO (J = 2 - 1) transition from the massive cold dense core G333.125-0.562. The core remains undetected at wavelengths shorter than 70 micron and has compact 1.2 mm dust continuum. The SiO emission is localised to the core. The observations are part of a continuing multi-molecular line survey of the giant molecular cloud G333. Other detected molecules in the core include 13CO, C18O, CS, HCO+, HCN, HNC, CH3OH, N2H+, SO, HC3N, NH3, and some of their isotopes. In addition, from NH3 (1,1) and (2,2) inversion lines, we obtain a temperature of 13 K. From fitting to the spectral energy distribution we obtain a colour temperature of 18 K and a gas mass of 2 x 10^3 solar mass. We have also detected a 22 GHz water maser in the core, together with methanol maser emission, suggesting the core will host massive star formation. We hypothesise that the SiO emission arises from shocks associated with an outflow in the cold core.

6 pages, 4 figures, 1 table, to be published in MNRAS

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Cited by in corpus (15)

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• A Spitzer Space Telescope survey of massive young stellar objects in the G333.2-0.4 giant molecular cloud
• Supersonic turbulence in the cold massive core JCMT 18354-0649S
• Mopra line survey mapping of NGC6334I and I(N) at 3mm
• Tracing H2 column density with atomic carbon (CI) and CO isotopologues
• Infall, outflow, and turbulence in massive star-forming cores in the G333 giant molecular cloud
• Observations and radiative transfer modelling of a massive dense cold core in G333
• Search for synchrotron emission from secondary leptons in dense cold starless cores
• SiO Outflows in the Most Luminous and Massive Protostellar Sources of the Southern Sky
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - IV. Ammonia towards dust emission
• Scaled up low-mass star formation in massive star-forming cores in the G333 giant molecular cloud
• Masers in star forming regions
• The Chemistry and Kinematics of Two Molecular Clouds near Sagittarius A*