レッドシフトz = 0.658のレンズ付きクエーサーの強い重力状態からの反射
R C Reis1, M T Reynolds1, J M Miller1
1Department of Astronomy, University of Michigan, Ann Arbor, Michigan 48109, USA.
Nature
|March 7, 2014
まとめ
超大質量ブラックホールは,混沌としてではなく,一貫して成長し,適度な赤道移転で成長します. この研究では,相対性反射を用いて,z=0.658で高いブラックホールのスピンを測定し,持続的な蓄積増加を示しました.
科学分野:
- 天体物理学と宇宙学について
- ブラックホール物理学 ブラックホール物理学
- 銀河の進化 銀河の進化 銀河の進化
背景:
- 超大質量ブラックホール (SMBH) のスピンは,宿主銀河との共進化の重要な指標である.
- SMBHは,高赤字 (z > 2) での合併による増殖によって成長すると考えられており,これは高回転につながります.
- 適度な赤偏移 (z < 1) で SMBH の蓄積モード (一貫性 vs. 混沌) は,まだ十分に理解されていません.
研究 の 目的:
- スピンを測定することによって,中程度の赤道移転のSMBHの蓄積歴を調査する.
- z ~ 0.5-1のSMBHが主に一貫したまたは混沌とした増殖によって成長するかどうかを決定する.
主な方法:
- アーカイブX線データの分析と,z = 0.658.8の重力レンズクエーサーの深層観測を組み合わせた.
- SMBHの回転の測定は,内部の蓄積円盤からの相対的な反射特性の研究を通じて行われます.
- 弱い反射信号を検出するための距離の制限を克服するために重力レンズを使用します.
主要な成果:
- ブラックホールの3つの重力半径内で発生する相対論的反射特性の検出.
- 高いブラックホールのスピンパラメータの決定,a = 0.87(+0.08)(-0.15) 3σ信頼度で,a > 0.66 5σで.
- 測定された高スピンは,一貫した蓄積エピソードによる成長を強く示唆しています.
結論:
- レンズ付きクワザーのSMBHは,高スピンを示しており,一貫した増殖による成長と一致しています.
- この発見は,中程度の赤偏差 (0.5 ≤ z ≤ 1) でのSMBHの成長は,主に一貫した増殖によって駆動されていることを示唆しています.
- この研究は,適度な赤偏移のクエーサーにおける相対性反射の最初の重要な検出を提供し,スピン測定を可能にします.
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