双重超大質量ブラックホール系NGC 6240の2つの別々の流出
F Müller-Sánchez1, R Nevin2, J M Comerford2
1Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO, USA. francisco.mullersanchez@colorado.edu.
Nature
|April 20, 2018
まとめ
銀河の合体により 超大質量ブラックホールが2つ生まれ 銀河の流出を促します 観測により,NGC6240の星形成とブラックホールによる流出が明らかにされ,銀河のフィードバックに影響を与えています.
科学分野:
- 天体物理学
- 銀河の進化
- 観測天文学
背景:
- 銀河の合併は 超大質量ブラックホールを二重に形成し 恒星形成と流出を誘発すると考えられています
- 過去の観測は 星爆発やブラックホールによる流出を 支持していますが 星間媒介との相互作用は 明らかになっていません
- 恒星形成とブラックホールの活動が銀河のフィードバックに与える相対的な貢献は十分に理解されていません.
研究 の 目的:
- NGC6240のプロトタイプの合併における二重出流の性質と相互作用を調査する.
- スターバーストやブラックホールによる 流出を空間的に隔離し 独立に研究する
- 質量流出率を決定し 銀河のフィードバックへの影響を評価する
主な方法:
- NGC6240の中央部における二重出流の観測
- [OIII] (ブラックホールによる) とHα (スターバーストによる) の流出を空間的に分離して分析する.
- 各コンポーネントの質量流出率を推定する.
主要な成果:
- NGC 6240の北東にブラックホールによる[O III]流出と北西にスターバーストによるHα流出を特定した.
- [O III]コーンでは年間75太陽質量,Hαバブルでは年間10太陽質量と推定される.
- 質量流出率は 恒星形成率に匹敵します
結論:
- ブラックホールの活動と恒星形成の二重流出は共存し,銀河の合併で独立して研究することができます.
- これらの流出は 銀河のフィードバックにおいて重要な役割を果たし 恒星形成を制御する可能性があります
- この発見は,銀河の進化とフィードバックメカニズムの理論的モデルに重要な観測証拠を提供します.
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