巨大な若い星群によって蓄積されたガスから新しい星群の形成

Chengyuan Li^1,2,3, Richard de Grijs^1,4, Licai Deng²

¹Kavli Institute for Astronomy and Astrophysics and Department of Astronomy, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, China.

Nature

|January 29, 2016

まとめ

巨大な星群はガスの蓄積によって新しい星を形成し,複数の星群を説明します. これは古代球体群の単発形成理論に異議を唱える.

科学分野:

天文学と天体物理学
星の進化について
銀河の形成

背景:

巨大な星群は通常"つのイベントで星を形成します
古い巨大な球状星団は複数の恒星集団を示し,複数の恒星形成エピソードを示唆しています.
アシンプトティック・ジャイアント・ブランチ・スターからの衝突した恒星風は,巨大な星群における第2世代恒星形成の引き金であると考えられています.

研究の目的:

巨大な星群の複数の星群の形成メカニズムを調査する.
銀河団内の恒星形成にガス蓄積が燃料となるという仮説を検証するためです
銀河団の進化を形作る銀河環境の役割を探求する

主な方法:

マゲラン雲の3つの巨大で若い星群 (1-20億年) の観測.
恒星群の分析により,異なる恒星形成期を特定する.
銀河のガスディスク内のガス蓄積のモデリング.

主要な成果:

最初の星団形成から数億年後に発生した爆発のような星形成の証拠
ガス蓄積が後の恒星形成に役立つことを示した.
球状星群の複数の星群を説明するための潜在的な経路の特定.

結論:

銀河盤内のガスの蓄積は巨大な星群で複数の星形成を可能にします
この蓄積過程は,古代の球状星群で観測された複数の恒星群の合理的な説明を提供します.
発見は単一爆発形成モデルに異議を唱え,クラスタの進化における環境要因の重要性を強調しています.

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