ALMA ACA and Nobeyama Observations of Two Orion Cores in Deuterated Molecular Lines

Ken'Ichi Tatematsu, Tie Liu, Gwanjeong Kim, Hee Weon Yi, Jeong Eun Lee, Naomi Hirano, Sheng Yuan Liu, Satoshi Ohashi, Patricio Sanhueza, James Di Francesco, Neal J. Evans, Gary A. Fuller, Ryo Kandori, Minho Choi, Miju Kang, Siyi Feng, Tomoya Hirota, Takeshi Sakai, Xing Lu, Quang Nguyen Lu'O'NgMark A. Thompson, Yuefang Wu, Di Li, Kee Tae Kim, Ke Wang, Isabelle Ristorcelli, Mika Juvela, L. Viktor Tóth

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Abstract

We mapped two molecular cloud cores in the Orion A cloud with the 7 m Array of the Atacama Compact Array (ACA) of the Atacama Large Millimeter/submillimeterArray (ALMA) and with the Nobeyama 45 m radio telescope. These cores have bright N2D+ emission in single-pointing observations with the Nobeyama 45 m radio telescope, have a relatively high deuterium fraction, and are thought to be close to the onset of star formation. One is a star-forming core, and the other is starless. These cores are located along filaments observed in N2H+ and show narrow line widths of 0.41 km s-1 and 0.45 km s-1 in N2D+, respectively, with the Nobeyama 45 m telescope. Both cores were detected with the ALMA ACA 7 m Array in the continuum and molecular lines at Band 6. The starless core G211 shows a clumpy structure with several sub-cores, which in turn show chemical differences. Also, the sub-cores in G211 have internal motions that are almost purely thermal. The starless sub-core G211D, in particular, shows a hint of the inverse P Cygni profile, suggesting infall motion. The star-forming core G210 shows an interesting spatial feature of two N2D+ peaks of similar intensity and radial velocity located symmetrically with respect to the single dust continuum peak. One interpretation is that the two N2D+ peaks represent an edge-on pseudo-disk. The CO outflow lobes, however, are not directed perpendicular to the line connecting both N2D+ peaks.
Original languageEnglish
Article number119
Number of pages21
JournalThe Astrophysical Journal
Volume895
Issue number2
DOIs
Publication statusPublished - 3 Jun 2020

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