磁場によって制御される自己類似の断片化は,巨大な恒星を形成する領域の磁場によって制御される

Hua-bai Li¹, Ka Ho Yuen¹, Frank Otto¹

¹Department of Physics, The Chinese University of Hong Kong, Shatin, New Territory, Hong Kong, China.

Nature

|March 31, 2015

まとめ

磁場は,巨大な恒星形成に不可欠です. NGC 6334では,オーダーされた磁場が様々なスケールでガスの断片化を決定し,長方形の構造とアニゾトロプ的収縮につながります.

科学分野:

天体物理学天体物理学
スター・フォーメーション
マグネトヒドロダイナミクス

背景:

分子雲は,しばしば糸状で,星を形成します. 磁場は,雲間領域に平行または垂直に雲を形成することによって,低質量恒星形成に影響を与えます.
巨大な恒星形成の核における磁場の役割と,中間のスケール (10〜0.01パーセク) での断片化への影響は不明である.

研究の目的:

巨大な恒星形成領域の断片化における磁場の役割を調査する.
NGC 6334の広範囲のスケール (100〜0.01パーセック) で磁場形態をマッピングする.

主な方法:

NGC 6334.4の極測観測を用いた推論された磁場地図.
フィールド形態論と,複数のスケールにおけるガス構造との関係を分析した.

主要な成果:

NGC 6334で観測された動的に重要な有序な磁場は,スケールを超えて一貫しています.
磁場に垂直に形成される長方形の構造を持つ自己類似のガスの断片化を発見した.
ガス延伸の末端に密度ピークを発見し,対称的にフィールドを絞り込み,密度^0.4に比例するフィールド強度で,アニゾトロプ的収縮を示しています.

結論:

磁場は,NGC 6334.4のような巨大な恒星形成領域内のガスの断片化に重要な役割を果たしています.
観測されたアニゾトロピックガスの収縮は,磁場が,巨大な恒星形成における蓄積過程を調節することを示唆している.

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