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Molecular outflow l...
Molecular outflow launched beyond the disk edge
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- Alves, F. O. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Girart, J. M. (författare)
- Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC
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- Caselli, P. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Franco, G. A. P. (författare)
- Universidade Federal de Minas Gerais
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- Zhao, B. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Vlemmings, Wouter, 1974 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Evans, M. G. (författare)
- University of Leeds
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- Ricci, L. (författare)
- Rice University
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Max Planck Gesellschaft zur Förderung der Wissenschaften eV. (MPG) Institut de Ciències de l'Espai (ICE) - CSIC (creator_code:org_t)
- 2017-07-13
- 2017
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 603, s. Article no L3 -
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http://publications.... (primary) (free)
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https://www.aanda.or...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- One of the long-standing problems of star formation is the excess of angular momentum of the parent molecular cloud. In the classical picture, a fraction of angular momentum of the circumstellar material is removed by the magneto-centrifugally driven disk wind that is launched from a wide region throughout the disk. In this work, we investigate the kinematics in the envelope-disk transition zone of the Class I object BHB07-11, in the B59 core. For this purpose, we used the Atacama Large Millimeter/submillimeter Array in extended configuration to observe the thermal dust continuum emission (lambda(0) similar to 1.3 mm) and molecular lines (CO, (CO)-O-18 and H2CO), which are suitable tracers of disk, envelope, and outflow dynamics at a spatial resolution of similar to 30 AU. We report a bipolar outflow that was launched at symmetric positions with respect to the disk (similar to 80 AU in radius), but was concentrated at a distance of 90-130 AU from the disk center. The two outflow lobes had a conical shape and the gas inside was accelerating. The large off set of the launching position coincided with the landing site of the infall materials from the extended spiral structure (seen in dust) onto the disk. This indicates that bipolar outflows are efficiently launched within a narrow region outside the disk edge. We also identify a sharp transition in the gas kinematics across the tip of the spiral structure, which pinpoints the location of the so-called centrifugal barrier.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Pipe Nebula
- Dynamics
- Protostar
- Alma
- B59
- Young Stars
- Gas
- Dark Cloud
- Cores
- Star-Formation Activity
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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