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初期と近代の円盤銀河の渦巻の起源として高い恒星形成率
Andrew W Green1, Karl Glazebrook, Peter J McGregor
1Centre for Astrophysics and Supercomputing, Swinburne University, PO Box 218, Hawthorn, Victoria 3122, Australia. agreen@astro.swin.edu.au
Nature
|October 9, 2010
まとめ
ガス蓄積ではなく,星形成が,銀河の円盤の渦巻を宇宙時間全体で駆動している. この発見は,初期の銀河の進化に関する以前の理論に異議を唱え,銀河のダイナミクスに関する新しい洞察を提供します.
科学分野:
- 天文学と天体物理学について
- 宇宙進化の宇宙進化について
- 銀河の形成とダイナミクス
背景:
- 初期の銀河は,高速度分散を示し,渦巻円盤を示唆しています.
- 以前のモデルでは,冷たいガスの蓄積が,この渦巻に燃料を供給することを提案していました.
- 観測された蓄積の流れとそのエネルギー貢献は,まだ確認されていない.
研究 の 目的:
- 高速分散円盤銀河における乱流の要因を調査する.
- 増殖ではなく,星形成が銀河の円盤の乱流を動かすという仮説を検証する.
- 銀河の進化を宇宙の時代にわたって支配するエネルギー過程を理解するために.
主な方法:
- 近くの宇宙にある,稀な,高速分散円盤銀河のサンプルを観測した.
- 銀河の動力学,恒星形成率,質量,ガス分数の分析.
- 速度の分散と銀河の特性との相関分析.
主要な成果:
- これらの銀河の速度分散は,それらの恒星形成率と相関しています.
- 速度の分散と銀河の質量またはガス分数の間に有意な相関は見つかりませんでした.
- これらの発見は,星形成が円盤の乱流の主要な原動力であることを示唆しています.
結論:
- 星の形成は,銀河の円盤の乱流のエネルギー的な原動力として特定されています.
- このメカニズムは,すべての宇宙時代において有意であると提案されています.
- この研究は,銀河の進化を左右する物理的過程に関する我々の理解を再構築する.
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