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Observing the onset of outflow collimation in a massive protostar

C. Carrasco-Gonzalez ; J. M. Torrelles ; J. Canto ; S. Curiel ; G. Surcis ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; H. J. van Langevelde ; C. Goddi ; G. Anglada ; S. W. Kim ; J. S. Kim ; J. F. Gomez
Science (0036-8075). Vol. 348 (2015), 6230, p. 114-117.
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2015-05-18. Senast ändrad 2016-02-03.
CPL Pubid: 217197

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


Magnetic fields and the outflows during the formation and evolution of stars (OUTFLOWMAGN) (EC/FP7/614264)