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      ALMA ACA and Nobeyama observations of two Orion cores in deuterated molecular lines

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          Abstract

          We mapped two molecular cloud cores in the Orion A cloud with the ALMA ACA 7-m Array and with the Nobeyama 45-m radio telescope. These cores have bright N\(_2\)D\(^+\) emission in single-pointing observations with the Nobeyama 45-m radio telescope, have 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 N\(_2\)H\(^+\), and show narrow linewidths of 0.41 km s\(^{-1}\) and 0.45 km s\(^{-1}\) in N\(_2\)D\(^+\), respectively, with the Nobeyama 45-m telescope. Both cores were detected with the ALMA ACA 7m Array in the continuum and molecular lines at Band 6. The starless core G211 shows 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 N\(_2\)D\(^+\) peaks of similar intensity and radial velocity located symmetrically with respect to the single dust continuum peak. One interpretation is that the two N\(_2\)D\(^+\) peaks represent an edge-on pseudo-disk. The CO outflow lobes, however, are not directed perpendicular to the line connecting both N\(_2\)D\(^+\) peaks.

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          Author and article information

          Journal
          26 April 2020
          Article
          2004.12548
          d240e469-a2ea-483d-88ca-9d876a81b86d

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          31 pages, 17 figures, 9 tables, to appear in ApJ (accepted April 23, 2020)
          astro-ph.GA

          Galaxy astrophysics
          Galaxy astrophysics

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