Tatematsu, K, Liu, T, Kim, G et al. (25 more authors) (2020) ALMA ACA and Nobeyama Observations of Two Orion Cores in Deuterated Molecular Lines. The Astrophysical Journal, 895 (2). 119. ISSN 0004-637X
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | Star forming regions; Astrochemistry; Interstellar medium; Giant molecular clouds; Molecular clouds; Collapsing clouds |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 Jul 2022 14:00 |
Last Modified: | 11 Jul 2022 14:00 |
Status: | Published |
Publisher: | Institute of Physics Publishing |
Identification Number: | 10.3847/1538-4357/ab8d3e |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:188767 |