Observing the onset of outflow collimation in a massive protostar
Journal article, 2015

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.

Author

C. Carrasco-Gonzalez

Universidad Nacional Autonoma de Mexico

J. M. Torrelles

Institute of Space Sciences (ICE) - CSIC

J. Canto

Universidad Nacional Autonoma de Mexico

S. Curiel

Universidad Nacional Autonoma de Mexico

G. Surcis

Joint Institute for VLBI in Europe (JIVE)

Wouter Vlemmings

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

H. J. van Langevelde

Leiden University

Joint Institute for VLBI in Europe (JIVE)

C. Goddi

Radboud University

Joint Institute for VLBI in Europe (JIVE)

G. Anglada

CSIC - Instituto de Astrofísica de Andalucía (IAA)

S. W. Kim

University of Science and Technology (UST)

Korea Astronomy and Space Science Institute

J. S. Kim

National Astronomical Observatory of Japan

J. F. Gomez

CSIC - Instituto de Astrofísica de Andalucía (IAA)

Science

0036-8075 (ISSN)

Vol. 348 6230 114-117

Magnetic fields and the outflows during the formation and evolution of stars (OUTFLOWMAGN)

European Commission (FP7), 2014-05-01 -- 2019-04-30.

Subject Categories

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

DOI

10.1126/science.aaa7216

More information

Latest update

9/10/2019