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Observing the onset of outflow collimation in a massive protostar

Carrasco-Gonzalez, C. (author)
Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
Torrelles, J. M. (author)
Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC
Canto, J. (author)
Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
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Curiel, S. (author)
Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
Surcis, G. (author)
Joint Institute for VLBI in Europe (JIVE)
Vlemmings, Wouter, 1974 (author)
Chalmers tekniska högskola,Chalmers University of Technology
van Langevelde, H. J. (author)
Joint Institute for VLBI in Europe (JIVE),Universiteit Leiden (UL),Leiden University (UL)
Goddi, C. (author)
Joint Institute for VLBI in Europe (JIVE),Radboud Universiteit,Radboud University
Anglada, G. (author)
Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
Kim, S. W. (author)
University of Science and Technology (UST),Korea Astronomy and Space Science Institute
Kim, J. S. (author)
National Astronomical Observatory of Japan
Gomez, J. F. (author)
Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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 (creator_code:org_t)
American Association for the Advancement of Science (AAAS), 2015
2015
English.
In: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 348:6230, s. 114-117
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The current paradigm of star formation through accretion disks, and magnetohydrodynamically driven gas ejections, predicts the development of collimated outflows, rather than expansion without any preferential direction. We present radio continuum observations of the massive protostar W75N(B)-VLA 2, showing that it is a thermal, collimated ionized wind and that it has evolved in 18 years from a compact source into an elongated one. This is consistent with the evolution of the associated expanding water-vapor maser shell, which changed from a nearly circular morphology, tracing an almost isotropic outflow, to an elliptical one outlining collimated motions. We model this behavior in terms of an episodic, short-lived, originally isotropic ionized wind whose morphology evolves as it moves within a toroidal density stratification.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

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