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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2603.20666 |
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| author | Tatematsu, Ken'ichi Nishimura, Atsushi Ogawa, Hideo Sakai, Nami Sakai, Takeshi Tokuda, Kazuki Hasegawa, Yutaka Yamasaki, Yasumasa Onishi, Toshikazu Hirano, Naomi Liu, Sheng-Yuan Liu, Tie Dutta, Somnath Sahu, Dipen Lee, Chin-Fei Kim, Kee-Tae Fuller, Gary A. Hsu, Shih-Ying Yi, Hee-Weon Masui, Sho Nishimoto, Shimpei Miyazawa, Chieko Takahashi, Toshikazu Maekawa, Jun Gonzalez, Alvaro Kojima, Takafumi Kaneko, Keiko Miyato, Ken |
| author_facet | Tatematsu, Ken'ichi Nishimura, Atsushi Ogawa, Hideo Sakai, Nami Sakai, Takeshi Tokuda, Kazuki Hasegawa, Yutaka Yamasaki, Yasumasa Onishi, Toshikazu Hirano, Naomi Liu, Sheng-Yuan Liu, Tie Dutta, Somnath Sahu, Dipen Lee, Chin-Fei Kim, Kee-Tae Fuller, Gary A. Hsu, Shih-Ying Yi, Hee-Weon Masui, Sho Nishimoto, Shimpei Miyazawa, Chieko Takahashi, Toshikazu Maekawa, Jun Gonzalez, Alvaro Kojima, Takafumi Kaneko, Keiko Miyato, Ken |
| contents | 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 $\int$-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' X 30' map of the northern $\int$-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 Tatematsu et al. High DNC/HN$^{13}$C 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' X 3' maps of the individual starless cores in Orion, the column density ratios of DNC/HN$^{13}$C and DCO$^+$/H$^{13}$CO$^+$ are 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_20666 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Observations of DNC and DCO$^+$ toward the $\int$-shaped Filament and Starless Cores in the Orion Molecular Clouds Tatematsu, Ken'ichi Nishimura, Atsushi Ogawa, Hideo Sakai, Nami Sakai, Takeshi Tokuda, Kazuki Hasegawa, Yutaka Yamasaki, Yasumasa Onishi, Toshikazu Hirano, Naomi Liu, Sheng-Yuan Liu, Tie Dutta, Somnath Sahu, Dipen Lee, Chin-Fei Kim, Kee-Tae Fuller, Gary A. Hsu, Shih-Ying Yi, Hee-Weon Masui, Sho Nishimoto, Shimpei Miyazawa, Chieko Takahashi, Toshikazu Maekawa, Jun Gonzalez, Alvaro Kojima, Takafumi Kaneko, Keiko Miyato, Ken Astrophysics of Galaxies 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 $\int$-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' X 30' map of the northern $\int$-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 Tatematsu et al. High DNC/HN$^{13}$C 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' X 3' maps of the individual starless cores in Orion, the column density ratios of DNC/HN$^{13}$C and DCO$^+$/H$^{13}$CO$^+$ are 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. |
| title | Observations of DNC and DCO$^+$ toward the $\int$-shaped Filament and Starless Cores in the Orion Molecular Clouds |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2603.20666 |