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星の物理 星の物理 巨大な原星における流出コリマーションの発生を観測した
C Carrasco-González1, J M Torrelles2, J Cantó3
1Centro de Radioastronomía y Astrofísica UNAM, Apartado Postal 3-72 (Xangari), 58089 Morelia, Michoacán, Mexico. carrasco@crya.unam.mx.
Science (New York, N.Y.)
|April 4, 2015
まとめ
巨大な原星W75N(B) -VLA 2は,コリマートされたイオン化された風を示し,18年にわたってコンパクトから長方形に進化しています. この観測は,イソトロプ的流出モデルに異議を唱え,多角形構造内のエピソード的風放出を裏付けている.
科学分野:
- * 天体物理学
- * 星の形成について
- * ラジオ天文学
背景:
- * 恒星形成の標準モデルは,蓄積円盤と磁気水力学によって引き起こされるコリマートアウトフローを予測しています.
- *以前の観測は,理論的な予測とは対照的に,巨大な原星からの同otropic 流出を示唆しました.
研究 の 目的:
- * 巨大原星W75N(B) -VLA 2からのイオン化された風の形態と進化を調査する.
- * 観測的証拠と,星形成と原星流出の理論的モデルを調和させる.
主な方法:
- * Very Large Array (VLA) を使用した無線連続観測.
- *原星とその関連する水蒸気マザー殻の形態学的変化を18年以上にわたって分析した.
- * 円形状の密度構造内のイオン化された風の進化のモデリング.
主要な成果:
- * W75N(B) -VLA 2は,熱的,コリマートされたイオン化された風を示しています.
- * 源泉は18年間でコンパクトな構造から伸びた構造に進化しました.
- * 水蒸気マザー殻は,ほぼ円形から円形に変化し,同otropic から collimated 運動への移行を示しています.
結論:
- * 観察された進化は,エピソード的,短命のイオン化された風のモデルを支持する.
- * 風の形状は,多角形密度の層構造を通って拡散するにつれて変化します.
- * 発見は,巨大な原星に対する純粋な同位流出モデルに異議を唱える.
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