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Hollow Cylindrical Lobes with a Helical Velocity Field of the L1551 Bipolar Flow

Published online by Cambridge University Press:  04 August 2017

Yutaka Uchida ,
Norio Kaifu ,
Kazunari Shibata ,
Saeko S. Hayashi  and
Tetsuo Hasegawa
Yutaka Uchida
Affiliation:
Tokyo Astronomical Observatory, University of Tokyo
Norio Kaifu
Affiliation:
Nobeyama Radio Observatory, TAO, University of Tokyo
Kazunari Shibata
Affiliation:
Department of Earth Science, Aichi University of Education
Saeko S. Hayashi
Affiliation:
Nobeyama Radio Observatory, TAO, University of Tokyo
Tetsuo Hasegawa
Affiliation:
Nobeyama Radio Observatory, TAO, University of Tokyo

Abstract

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Observations of the structure and the velocity field in the L1551 bipolar flow were made with the 45m telescope at Nobeyama in the 115GHz 12CO J = 1 – 0 line with high spatial resolution. It was found that the bipolar flow lobes have a clear hollow cylindrical structure and show evidence of a helical velocity field. They appear to rotate in the same direction as the CS disk found by Kaifu et al. (1984). The velocity of the flow in the bipolar directions increases with distance up to ∼ 3′ from the central object, IRS 5. These characteristics coincide with those predicted by the magnetodynamic theory proposed by Uchida and Shibata and indicate the essential importance of the magnetic field in producing such flows and also in the star-formation process itself through the enhancement of angular-momentum loss.

Type
I. Star Forming Processes in the Solar Neighborhood
Information
Symposium - International Astronomical Union , Volume 115: Star Forming Regions , 1987 , pp. 287 - 300
Copyright
Copyright © Reidel 1987 

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