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An Ordered Envelope...
An Ordered Envelope-Disk Transition in the Massive Protostellar Source G339.88-1.26
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- Zhang, Yichen (author)
- RIKEN
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- Tan, Jonathan, 1973 (author)
- University of Virginia,Chalmers tekniska högskola,Chalmers University of Technology
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- Sakai, N. (author)
- RIKEN
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- Tanaka, Kei E.I. (author)
- Osaka University,National Astronomical Observatory of Japan
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- De Buizer, James M. (author)
- NASA Ames Research Center
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- Liu, Mengyao (author)
- University of Virginia
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- Beltrán, M. T. (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Kratter, K. M. (author)
- University of Arizona
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- Mardones, Diego (author)
- Universidad de Chile (UCH),University of Chile (UCH)
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- Garay, G. (author)
- Universidad de Chile (UCH),University of Chile (UCH)
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(creator_code:org_t)
- 2019-03-06
- 2019
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 873:1
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Abstract
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- We report molecular line observations of the massive protostellar source G339.88-1.26 with the Atacama Large Millimeter/Submillimeter Array. The observations reveal a highly collimated SiO jet extending from the 1.3 mm continuum source, which connects to a slightly wider but still highly collimated CO outflow. Rotational features perpendicular to the outflow axis are detected in various molecular emissions, including SiO, SO 2 , H 2 S, CH 3 OH, and H 2 CO emissions. Based on their spatial distributions and kinematics, we find that they trace different parts of the envelope-disk system. The SiO emission traces the disk and inner envelope in addition to the jet. The CH 3 OH and H 2 CO emissions mostly trace the infalling-rotating envelope and are enhanced around the transition region between envelope and disk, i.e., the centrifugal barrier. The SO 2 and H 2 S emissions are enhanced around the centrifugal barrier and also trace the outer part of the disk. Envelope kinematics are consistent with rotating-infalling motion, while those of the disk are consistent with Keplerian rotation. The radius and velocity of the centrifugal barrier are estimated to be about 530 au and 6 , respectively, leading to a central mass of about 11 M o , consistent with estimates based on spectral energy distribution fitting. These results indicate that an ordered transition from an infalling-rotating envelope to a Keplerian disk through a centrifugal barrier, accompanied by changes of types of molecular line emissions, is a valid description of this massive protostellar source. This implies that at least some massive stars form in a similar way to low-mass stars via core accretion.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- stars: massive
- stars: formation
- ISM: individual objects (G339.88-1.26)
- ISM: jets and outflows
- ISM: molecules
- ISM: kinematics and dynamics
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Zhang, Yichen
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Tan, Jonathan, 1 ...
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Sakai, N.
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Tanaka, Kei E.I.
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De Buizer, James ...
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Liu, Mengyao
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show more...
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Beltrán, M. T.
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Kratter, K. M.
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Mardones, Diego
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Garay, G.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
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Astrophysical Jo ...
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Chalmers University of Technology