University of Hertfordshire

From the same journal

From the same journal

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

Research output: Contribution to journalArticlepeer-review


  • 200412548

    Accepted author manuscript, 5.89 MB, PDF document

  • 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'Ng
  • And 8 others
  • Mark A. Thompson
  • Yuefang Wu
  • Di Li
  • Kee Tae Kim
  • Ke Wang
  • Isabelle Ristorcelli
  • Mika Juvela
  • L. Viktor Tóth
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Original languageEnglish
Article number119
Number of pages21
JournalAstrophysical Journal
Publication statusPublished - 3 Jun 2020


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.


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