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Observations of DNC and DCO+ toward the ∫-shaped Filament and Starless Cores in the Orion Molecular Clouds
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Observations of DNC and DCO+ toward the ∫-shaped Filament and Starless Cores in the Orion Molecular Clouds
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Journal Article
Observations of DNC and DCO+ toward the ∫-shaped Filament and Starless Cores in the Orion Molecular Clouds
2026
Overview
Although the deuterium fraction is known to be a powerful evolutionary tracer, its variation within individual molecular cloud cores is still poorly understood. The northern ∫-shaped filament and 20 individual starless cores in the Orion A and B clouds were mapped in the deuterated molecules of DNC and DCO+ with the receiver 7BEE installed on the Nobeyama 45 m radio telescope. In a ∼5′×30′ map of the northern ∫-shaped filament in the Orion A cloud, the DNC emission is detected over the filament, whereas the DCO+ emission is localized toward OMC-3, the northernmost region of the filament. The difference in distribution between DNC and DCO+ can be attributed to that between N- and C-bearing molecules as previously suggested by K. Tatematsu et al. (2008). High DNC/HN13C column density ratios were observed in OMC-2 and OMC-3, and low ratios in OMC-1. It seems that OMC-2 and OMC-3 still contain molecular gas close to the onset of star formation. In 3′×3′ maps of the individual starless cores in Orion, the column density ratios of DNC/HN13C and DCO+/H13CO+ were found to be rather constant locally within each core, although the core-to-core variation is not small. Similar timescales of deuterization, depletion, and dynamical evolution might explain the locally constant ratio.
Publisher
IOP Publishing
Subject
