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超大質量ブラックホールは,銀河の円盤や擬似銀河と相関関係がない
John Kormendy1, R Bender, M E Cornell
1Department of Astronomy, University of Texas at Austin, 1 University Station, Austin, Texas 78712-0259, USA. kormendy@astro.as.utexas.edu
Nature
|January 21, 2011
まとめ
超大質量ブラックホールの質量は銀河の膨らみと相関しているが,円盤や擬似膨らみとは相関しない. これは,ブラックホールの供給モードが異なることを示唆しており,膨張の成長は合併と関連しており,偽膨張/ディスクの成長は局所的なプロセスに関連している.
科学分野:
- 天体物理学 天体物理学
- 銀河の進化 銀河の進化 銀河の進化
- ブラックホール物理学 ブラックホール物理学
背景:
- 超大質量ブラックホール (SMBH) の質量は,宿主銀河の膨張特性と相関しています.
- SMBHの質量は銀河の円盤と相関しているようには見えない.
- SMBHsと pseudobulges (ディスクで成長した構造) の間の関係はまだ不明です.
研究 の 目的:
- 擬似ボリュームがSMBH質量と相関するかどうかを調査する.
- 銀河とそれらの中央のブラックホールの共同進化を理解するために.
- ブラックホールの成長を調節するグローバル・プロセスとローカル・プロセスを区別する.
主な方法:
- 動的に検出されたSMBHを備えた銀河の擬似球体を分類する.
- 巨大な球形のない銀河の速度分散を分析する.
- SMBHの質量を宿主銀河の膨らみ,円盤,偽膨らみと比較する.
主要な成果:
- SMBHは銀河ディスクと相関関係がない.
- SMBHは,シドウブルゲとの相関がほとんどないか全くないことを示しています.
- この研究は,SMBHの質量-膨らみ相関とディスクとの相関の欠如を確認しています.
結論:
- 2つの異なるSMBHの栄養モードが提案されています:膨張の融合による急速な成長 (クワザルモード) と,膨張のない銀河や擬似膨張 (セイフェルトモード) でのより遅い,局所的な成長.
- 最大のSMBHは,グローバルプロセスによる膨張とともに共進化しています.
- 小型のSMBHは,局所的,ストキャスティックな成長のために,宿主銀河の構造と共進化しない.
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