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分子雲の磁場がM33のスパイラルアームと整合している
1Max-Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany. li@mpia.de
Nature
|November 18, 2011
まとめ
銀河の磁場は,巨大な分子雲を固定することで,星形成に影響を与えます. 銀河M33での観測は,磁場が螺旋腕と並んでおり,雲の構造と星の誕生に影響を及ぼしていることを示しています.
科学分野:
- 天体物理学 天体物理学
- 銀河のダイナミクス
- スター・フォーメーション
背景:
- 分子雲の形成は恒星形成に不可欠ですが,よく理解されていません.
- 個々の雲の形成における大規模な銀河磁場の役割は議論されている.
- 乱流と回転が磁場をランダム化したり,銀河の場が方向を押し付けることもあります.
研究 の 目的:
- 銀河の磁場が分子雲の方向化に及ぼす影響を調査する.
- 大規模な磁場が雲の蓄積と断片化を制御するかどうかを評価する.
- 恒星形成率と効率への影響を理解するために.
主な方法:
- 6つの巨大な分子雲の複合体における磁場向きの観測.
- 近隣の銀河M33からのデータを活用し,ほぼ直接観測した.
- 銀河構造に対するフィールドの並び方を分析した.
主要な成果:
- 巨大な分子雲の中の磁場は,M33.3の渦巻き腕と一致しています.
- この配列は,大規模な銀河場と雲の構造の間のつながりを示唆しています.
- この発見は,銀河場が分子雲を固定しているという仮説を裏付けている.
結論:
- 大規模な銀河磁場は,分子雲の組織化に重要な役割を果たしています.
- 磁場と螺旋の腕の並び合わせは,銀河の磁場がこれらの恒星の育児場を固定していることを示している.
- この固定が,星形成の速度と効率に影響を与える可能性が高い.
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