Observing the onset of outflow collimation in a massive protostar

Journal
Date Issued
2015
Author(s)
Carrasco-González, C.
•
Torrelles, J. M.
•
Cantó, J.
•
Curiel, S.
•
•
Vlemmings, W. H. T.
•
van Langevelde, H. J.
•
Goddi, C.
•
Anglada, G.
•
Kim, S. -W.
•
Kim, J. -S.
•
Gómez, J. F.
DOI
Abstract
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.
Volume
348
Issue
6230
Start page
114
Uri
Url
Issn Identifier
0036-8075
Ads BibCode
2015Sci...348..114C
Rights
open.access
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