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光照射された分子雲の圧縮と消去 オリオンバー
Javier R Goicoechea1, Jérôme Pety2,3, Sara Cuadrado1
1Grupo de Astrofísica Molecular, Instituto de Ciencia de Materiales de Madrid (CSIC), Calle Sor Juana Ines de la Cruz 3, E-28049 Cantoblanco, Madrid, Spain.
Nature
|August 12, 2016
まとめ
ダイナミックで断片化された分子雲の表面を明らかにします 静的モデルとは対照的に,高圧波による圧縮を示し,ガスタイプ間の移行は密接に並べられています.
科学分野:
- 天文学と天体物理学
- 星間媒体の物理
- ステラフィードバックメカニズム
背景:
- オリオン・バーは 巨大な恒星からの 強い紫外線にさらされた 分子雲の表面を 研究するための 重要な場所です
- 以前の研究では,イオン化と離散フロントの間の重要な空間分離が示唆され,静的均衡モデルは不均一な雲構造を予測しました.
- これらの構造を理解することは 恒星のフィードバックが 恒星形成領域にどのように影響するかを理解するために 極めて重要です
研究 の 目的:
- オリオン星座の分子雲の 構造と動態を前例のない解像度で調査する
- 新しい観測データに対して静的均衡モデルの予測をテストする.
- 異なるガス相変異 (H/H2とC+/C/CO) の空間的関係を決定する.
主な方法:
- 高解像度 (一弧秒) のミリ波画像を用いて分子雲の表面を解像した.
- H2の振動放射を分析して H/H2の移行を特定した.
- 分子ガスとイオン炭素ゾーンの境界をマッピングするために観測されたCOとHCO+排出量.
主要な成果:
- 静的モデルとは異なり,H/H2の移行とCO/HCO+の排出エッジの間の有意なオフセットは見つかりませんでした.
- 分子雲の表面は,高密度の基底構造を持つ断片化された山脊を示しています.
- 雲の表面で光分解性ガスの流れと不安定性の証拠が観察されました.
結論:
- H/H2とC+/C/COの移行ゾーンは空間的に一致し,以前の仮定に異議を唱える.
- 観測された断片化と動態は 高圧波によって 雲の縁が圧縮されていることを示唆しています
- ダイナミックで非均衡のプロセスが分子雲の表面の進化に重要な役割を果たします.
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