超コンパクトな矮星銀河の中の超大質量ブラックホール
Anil C Seth1, Remco van den Bosch2, Steffen Mieske3
1Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112, USA.
Nature
|September 19, 2014
まとめ
超コンパクトの矮星銀河は,超大質量ブラックホールを宿している可能性があります. M60-UCD1を研究したところ,巨大なブラックホールが発見され,これらの密集したシステムには銀河の核が剥がれている可能性があることを示唆した.
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
- 恒星力学 恒星力学とは
背景:
- 超コンパクト矮星系 (UCD) は,非常に密度の高い恒星系である.
- ダイナミック・マスの推定値は,UCDにおける光度に基づくマスをしばしば上回る.
- この質量差の起源は議論されている:超大質量ブラックホール (SMBHs) または非標準の恒星初期質量関数 (IMFs).
研究 の 目的:
- UCDにおける質量不一致の原因を調査する.
- M60-UCD1.1. 中央のブラックホールの存在と質量を決定する.
- UCDの形成経路を理解する.
主な方法:
- M60-UCD1.1.のための適応光学の動力学的データの取得
- 中心速度の分散と回転の分析.
- ブラックホールの質量を推定するためのダイナミックモデリング.
主要な成果:
- M60-UCD1は,中央速度分散ピーク>100 km/sと適度な回転を示しています.
- ダイナミック・モデリングでは,SMBHは太陽の質量2.1×10^7であることを示しています.
- このSMBHはM60-UCD1の総質量の15%を占めています.
結論:
- ブラックホールの高質量分数は,M60-UCD1が剥がれた銀河核であることを示唆しています.
- M60-UCD1の恒星質量は,その輝度と一致しています.
- これは,他のUCDで認識されていないSMBHの有意な人口を意味しています.
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