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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
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星のフィードバックは,スターバースト銀河の延長された分子流出の起源である
J E Geach1, R C Hickox2, A M Diamond-Stanic3
1Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB, UK.
Nature
|December 5, 2014
まとめ
スターバースト銀河は,恒星の放射線圧力によって,かなりの冷たい分子ガスを放出し,銀河の進化に影響を与えることができます. この発見は,恒星形成の断絶における恒星フィードバックの規模と効率に関する以前の仮定に異議を唱える.
科学分野:
- 天文学と天体物理学について
- 銀河の進化 銀河の進化 銀河の進化
- 星間媒介は,星間媒介である.
背景:
- スターバースト銀河は,恒星の放射圧を介して分子ガスの流出を駆動し,恒星の質量増加を制限します.
- 以前に観測されたアウトフローは,スケール (<1キロパルセック) と分子ガス分子が限られていた.
- アクティブな銀河核は,銀河からの流出に影響を与え,銀河のスケールにおける恒星のフィードバックの唯一の影響に疑問を投げかけることができる.
研究 の 目的:
- 星の爆発が,かなりの冷たい分子ガスを,大きな銀河中心半径 (約. 10キロパーセック).
- 巨大なスターバースト銀河の拡張分子ガスの速度と運動エネルギーを決定する.
- これらの大規模な分子流出を駆動する星の放射線圧の役割を評価する.
主な方法:
- 赤道偏移0.7.7のコンパクトで巨大な星爆発銀河の分子ガスの観測.
- 銀河の中心から約10キロパーセクまで広がるガス分布の分析.
- 拡張分子ガスの成分の速度測定.
主要な成果:
- 総分子ガスの35%は,約10キロパーセルに及ぶ.
- この膨張したガスの3分の1は,毎秒1000キロメートルまでの速度を示している.
- 高速ガスの運動エネルギーは,恒星放射線の圧力運動量流動と一致する.
結論:
- 巨大なスターバーストは,銀河の中心から大量の冷たい分子ガスを放出することができます.
- 恒星放射線の圧力は,これらの実質的な,拡張された分子流出を駆動することができる.
- これらのアウトフローは,恒星形成を断ち切り,物質を再分配することによって,銀河の進化に著しく影響を与えます.
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