TY - JOUR
T1 - ALMA ACA and Nobeyama Observations of Two Orion Cores in Deuterated Molecular Lines
AU - Tatematsu, Ken'Ichi
AU - Liu, Tie
AU - Kim, Gwanjeong
AU - Yi, Hee Weon
AU - Lee, Jeong Eun
AU - Hirano, Naomi
AU - Liu, Sheng Yuan
AU - Ohashi, Satoshi
AU - Sanhueza, Patricio
AU - Francesco, James Di
AU - Evans, Neal J.
AU - Fuller, Gary A.
AU - Kandori, Ryo
AU - Choi, Minho
AU - Kang, Miju
AU - Feng, Siyi
AU - Hirota, Tomoya
AU - Sakai, Takeshi
AU - Lu, Xing
AU - Lu'O'Ng, Quang Nguyen
AU - Thompson, Mark A.
AU - Wu, Yuefang
AU - Li, Di
AU - Kim, Kee Tae
AU - Wang, Ke
AU - Ristorcelli, Isabelle
AU - Juvela, Mika
AU - Tóth, L. Viktor
N1 - © 2020. The American Astronomical Society. All rights reserved.
PY - 2020/6/3
Y1 - 2020/6/3
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85086148200&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/ab8d3e
DO - 10.3847/1538-4357/ab8d3e
M3 - Article
AN - SCOPUS:85086148200
SN - 0004-637X
VL - 895
JO - The Astrophysical Journal
JF - The Astrophysical Journal
IS - 2
M1 - 119
ER -