Observing the onset of outflow collimation in a massive protostar
Artikel i vetenskaplig tidskrift, 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.

Författare

C. Carrasco-Gonzalez

Universidad Nacional Autonoma de Mexico

J. M. Torrelles

CSIC - Instituto de Ciencias del Espacio (ICE)

J. Canto

Universidad Nacional Autonoma de Mexico

S. Curiel

Universidad Nacional Autonoma de Mexico

G. Surcis

Joint Institute for VLBI in Europe

Wouter Vlemmings

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

H. J. van Langevelde

Joint Institute for VLBI in Europe

Universiteit Leiden

C. Goddi

Radboud Universiteit

Joint Institute for VLBI in Europe

G. Anglada

CSIC - Instituto de Astrofísica de Andalucía (IAA)

S. W. Kim

Korea Astronomy and Space Science Institute

University of Science and Technology (UST)

J. S. Kim

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

J. F. Gomez

CSIC - Instituto de Astrofísica de Andalucía (IAA)

Science

0036-8075 (ISSN)

Vol. 348 114-117

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

Europeiska kommissionen (FP7), 2014-05-01 -- 2019-04-30.

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1126/science.aaa7216