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Distortion of magnetic fields in the pre-stellar core Barnard 68

Published online by Cambridge University Press:  01 November 2008

Ryo Kandori ,
Motohide Tamura ,
Ken-ichi Tatematsu ,
Nobuhiko Kusakabe  and
Yasushi Nakajima
Ryo Kandori
Affiliation:
National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 email: r.kandori@nao.ac.jp
Motohide Tamura
Affiliation:
National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 email: r.kandori@nao.ac.jp
Ken-ichi Tatematsu
Affiliation:
National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 email: r.kandori@nao.ac.jp
Nobuhiko Kusakabe
Affiliation:
National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 email: r.kandori@nao.ac.jp
Yasushi Nakajima
Affiliation:
National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 email: r.kandori@nao.ac.jp
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Abstract

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Magnetic fields are believed to play an important role in controlling the stability and contraction of molecular cloud cores. In the present study, magnetic fields of a cold pre-stellar core, Barnard 68, have been mapped based on wide-field near-infrared polarimetric observations of background stars. A distinct “hourglass-shaped” magnetic field is identified toward the core, as the observational evidence of magnetic field structure distorted by mass accumulation in a pre-stellar core. Our findings on the geometry of magnetic fields as well as the mass-to-magnetic flux ratio are presented.

Keywords

Stars: formation – ISM: globules – ISM: magnetic fields – polarization
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 107 - 108
Copyright
Copyright © International Astronomical Union 2009

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