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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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セイフェルト銀河IC 5063の素早い分子流出のジェット加速
C Tadhunter1, R Morganti2, M Rose3
1Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
Nature
|July 22, 2014
まとめ
活発な銀河核のアウトフローは,ラジオジェットからの高速ショックによって分子ガスを加速することができます. この研究は,銀河IC 5063の高速分子水素の証拠を提供し,銀河の進化における衝撃加速メカニズムをサポートしています.
科学分野:
- 天体物理学 天体物理学
- 銀河の進化 銀河の進化 銀河の進化
- アクティブな銀河核 (AGN)
背景:
- AGNからの大規模な流出は,銀河の進化に不可欠であり,ガスの加熱,放出,恒星形成に影響を与えます.
- AGNジェットの分子ガス流出の加速と加熱における役割は提案されてきたが,直接的な観測証拠は欠けていた.
- 分子ガスは,しばしばAGNによる流出の大部分を構成する.
研究 の 目的:
- AGNのラジオロブ内の分子ガスの動力学的性質を調査する.
- AGNジェットによる分子ガスの加速の直接的な証拠を提供すること.
- 分子流出のための衝撃加速の実現可能性を実証するために.
主な方法:
- サイファート銀河IC 5063.3をターゲットにした観測天文学.
- ラジオロブ内の分子水素ガス運動学的分析.
- ガス速度の比較と放射性ジェットの特徴.
主要な成果:
- IC 5063の西側のラジオ葉にある温かい分子水素ガスは,銀河の円盤に比べて高い速度 (~600 km/sまで) を表しています.
- 観測された高速度は,膨張する無線ジェットによって生成される高速ショックによる加速を示唆しています.
- 分子ガスの動力学とラジオジェットの特徴の間の詳細な関連が確立されました.
結論:
- AGNのラジオジェットによって駆動される急速な衝撃は,分子ガスを効果的に加速することができます.
- このメカニズムは,銀河の巨大な分子流出を駆動するための実行可能な経路です.
- この発見は,銀河の進化を制御するAGNフィードバックの重要な役割を裏付けている.
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