ディスク-ディスク銀河の合体における近いクワザールペア z = 2.17
Yu-Ching Chen1,2, Xin Liu3,4, Adi Foord5
1Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
Nature
|April 5, 2023
まとめ
天文学者は,銀河の合併によってホストされた,宇宙の正午に最初の kpcスケールの二重クエーサーシステムを発見しました. この発見は 超大質量ブラックホールの進化について 重要な洞察を与えてくれます
科学分野:
- * 天文学と天体物理学
- 銀河の進化について
- * 宇宙学
背景:
- * 銀河の合体により 超大質量ブラックホール (SMBH) のペアが生成されます
- *これらのSMBHペアは,特にキロパーセック (kpc) スケール分離で,両方とも積極的に収縮しているときに二重クエーサーとして観測できます.
- * kpcスケールの二重活性銀河核は低赤偏移の合併で発見されているが,宇宙の正午 (z ≈ 2) で明確な二重クエーサーは特定されていない.
研究 の 目的:
- * 宇宙の正午のKPCスケールの二重クワザールシステムの発見と特徴を報告する.
- * 宿主銀河の性質を調査し,このシステムのための証拠を統合する.
- 超大質量ブラックホールの形成と進化の意味を理解する.
主な方法:
- * スローン・デジタル・スカイ・サーベイ (SDSS) J0749+2255の多波長観測
- * 拡大した宿主銀河と低表面明るさの潮の特徴の分析
- * クワザール核の分離と宿主銀河の形態の調査.
主要な成果:
- SDSS J0749+2255は,赤偏差z = 2.17でkpcスケール (3.8kpc分離) の二重クワザールシステムとして識別されました.
- * 銀河の融合を証明する 拡大した宿主銀河と 潮の特徴の発見
- * 主体銀河は巨大で,コンパクトで,円盤が優勢で,顕著な恒星の膨らみがない.
結論:
- これは宇宙の正午に発見された 明確なKpcスケールの二重クワザールシステムです
- *宿主銀河の性質は,SMBHが宿主恒星の膨らみより前に形成される可能性があることを示唆しています.
- * システムは,約0.22Gyr以内の重力結合バイナリSMBHを形成する可能性がある軌道上にあります.
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