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100億年前のクエーサーのブラックホールの質量の動的測定
R Abuter1, F Allouche2, A Amorim3,4
1European Southern Observatory, Garching, Germany.
Nature
|January 29, 2024
まとめ
超大質量ブラックホール (SMBH) の質量を 遠くにあるクエーサーで測定したところ 宿主銀河では 予想より小さいことが分かりました これは,銀河がSMBHよりも速く成長し,共同進化が遅れていることを示唆しています.
科学分野:
- * 天文学と天体物理学
- 銀河の進化について
- * ブラックホール物理学
背景:
- * 銀河と超大質量ブラックホール (SMBH) は,局所宇宙で密接な相関を示し,共進化を示唆しています.
- *クエーザーの蓄積によるエネルギーフィードバックは,この共進化を制御するメカニズムである.
- * 高い赤偏移 (1-3) でこの関係を理解することは,宇宙の進化を追跡するために不可欠です.
研究 の 目的:
- * 赤い偏移2 (11億年前) の明るいクエーザーのSMBH質量を動的に測定する.
- * 銀河とSMBHの共同進化を調査する
- * SMBHの質量を宿主銀河の質量と比較し,その成長関係を評価する.
主な方法:
- * ブラックホールの質量の空間的に解明されたダイナミック測定は,クエーザーのブロードライン領域 (BLR) を使用しています.
- * 回転するBLRの速度グラデーションを追跡するために,Hα線光センターオフセットの分析.
- * 分子ガスのデータを用いて宿主銀河の動的質量の計算.
主要な成果:
- * 回転するBLRと一致するHα線の空間的なオフセットが検出されました.
- * 中央のブラックホールの質量は,太陽の質量3.2 × 108と決定された.
- * 宿主銀河の動的質量は6 × 10 11 太陽質量であり,低質量SMBHを示しています.
結論:
- * SMBHは赤道偏移2で宿主銀河に比べて質量が低いように見えます.
- * この発見は宿主銀河が SMBHよりも速く成長することを示唆しています
- * 宿主銀河の形成に比べてSMBHの形成または成長が遅れていることがいくつかのシステムで示されています.
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