Zooming in to Massive Star Birth

Abstract

We present high resolution (0.2", 1000 AU) 1.3 mm ALMA observations of massive infrared dark cloud clump, G028.37+00.07-C1, thought to harbor the early stages of massive star formation. Using ${\mathrm{N}}_2{\mathrm{D}}^{+}$(3-2) we resolve the previously identified C1-S core, separating the bulk of its emission from two nearby protostellar sources. C1-S is thus identified as a massive ($\sim 50M_{\odot }$), compact ($\sim 0.1$pc diameter) starless core, e.g., with no signs of outflow activity. Being highly deuterated, this is a promising candidate for a pre-stellar core on the verge of collapse. An analysis of its dynamical state indicates a sub-virial velocity dispersion compared to a trans-Alfvénic turbulent core model. However, virial equilibrium could be achieved with sub-Alfvénic conditions involving $\sim 2$mG magnetic field strengths.

arXiv comment19 pages, 15 figures, 4 tables, accepted by ApJ

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Cited by in corpus (21)

• The ALMA Survey of 70 $\mu$m dark High-mass clumps in Early Stages (ASHES). I. Pilot Survey: Clump Fragmentation
• GMC Collisions as Triggers of Star Formation. III. Density and Magnetically Regulated Star Formation
• Zooming in on Individual Star Formation: Low- and High-mass Stars
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• ALMA Reveals A Collision Between Protostellar Outflows in BHR71
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• Deuterium Chemodynamics of Massive Pre-Stellar Cores
• Collision of molecular outflows in the L1448--C system
• Star Formation in a Strongly Magnetized Cloud
• The CARMA-NRO Orion Survey: Core Emergence and Kinematics in the Orion A Cloud
• Sulphur-Bearing and Complex Organic Molecules in an Infrared Cold Core
• Binary Formation in a 100 $\mu$m-dark Massive Core