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赤い偏移が7.5で,かなり中立な宇宙にある800万太陽質量ブラックホール
Eduardo Bañados1, Bram P Venemans2, Chiara Mazzucchelli2
1The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, California 91101, USA.
Nature
|December 7, 2017
まとめ
天文学者は赤道偏移7.54のクエーサー J1342+0928を発見し,初期の宇宙のブラックホールの成長を洞察しました. この発見は 急速なブラックホールの形成 または再イオン化の時代の超大質量ブラックホールの形成を示唆しています
科学分野:
- 宇宙学
- 天体物理学
- ブラックホール物理学
背景:
- クエサールは宇宙で最も明るい物体で 初期の宇宙の研究を可能にしています
- ULAS J1120+0641は,赤道偏移 z > 7 で5年以上にわたって唯一知られているクエーサーであり,初期の宇宙の研究を制限しました.
- 初期の宇宙における 超大質量ブラックホールの形成と成長を理解することは 重要な課題です
研究 の 目的:
- 新しいクエーザーの発見と特徴を報告する 記録的な赤道移転
- 初期の宇宙における 超大質量ブラックホールの 成長を調査するためです
- 再イオン化時代における 銀河間媒体の中性水素分子を 探査する
主な方法:
- クワサールULAS J134208.10+092838.61 (J1342+0928) の赤偏差 z = 7.54での観測
- クエーザーのボロメトリック光度とブラックホールの質量の分析.
- ガン・ピーターソン抑制翼を検出して ニュートラルな水素分子を推測する
主要な成果:
- J1342+0928の発見,z=7.54のクエーザーで,ボロメトリック光度が太陽の4×10^13倍である.
- 推定ブラックホールの質量は 8×10^8 太陽質量で 宇宙が6億9千万年前に存在していた
- 銀河間媒質に有意な中性水素 (>33%で68%の確率) が存在し,ガン・ピーターソン減圧翼によって示されている.
結論:
- J1342+0928の存在は,初期のブラックホールの成長モデルに挑戦し,大規模な初期ブラックホールの種子またはハイパーエディントン増殖の理論を支持します.
- クワザーのスペクトルは この時代に宇宙が ニュートラルだったことを示し 再イオン化の時代を 探査していることを示しています
- この発見は,初期の宇宙における銀河と超大質量ブラックホールの共同進化を理解するための重要な観測データを提供します.
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