銀河のハロで大規模なX線バブルの検出
P Predehl1, R A Sunyaev2,3, W Becker4,5
1Max-Planck-Institut für Extraterrestrische Physik, Garching, Germany. predehl@mpe.mpg.de.
Nature
|December 10, 2020
まとめ
銀河系 から 14 キロパーセック ほど 広がる 巨大な X 線 の 泡 が 発見 さ れ た
科学分野:
- * 天体物理学
- * 銀河の形成と進化
- * プラズマ物理学
背景:
- 銀河の形成モデルを理解するのに不可欠な 衝撃を受けた熱いガスを含んでいます
- * 過去の核活動がハロにエネルギーを注入したことを示していますが,その起源 (超大質量ブラックホールと対比) と大規模な特徴との関連は不明です.
研究 の 目的:
- ミルクウェイのハローへのエネルギー注入の起源と性質を調査する.
- * 核活動と大規模な銀河構造の間の因果関係を確立する.
- * 新しく発見されたX線を放つバブルと,その環銀河媒質への影響について説明する.
主な方法:
- * 泡の構造を検出し,マッピングするための柔らかいX線観測.
- * 衝撃の特徴を特定するためのバブル境界の分析
- * 既存のガンマ線データと銀河形成の理論モデルとの比較
主要な成果:
- * 銀河の中心上下14キロパーセックに広がる 柔らかいX線を放つ泡を発見した.
- * 南の空に北極スパーに類似する構造を特定した.
- * 鋭いバブル境界は衝突のない非放射性ショックを示し,局所的な超新星残骸ではなく,銀河規模の構造を示唆しています.
結論:
- *X線バブルはおそらく 銀河の中心からの大きなエネルギー注入によって引き起こされ,おそらくガンマ線の特徴に関連しています.
- *X線バブルの推定エネルギー (~10^56 erg) は,環銀河媒体の構造,エネルギー,化学的濃縮に大きな影響を与えるのに十分である.
- * この発見は 銀河の核活動と 銀河周りの環境との間に 強い関係があることを 証明しています
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