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Highly Resolved Intravital Striped-illumination Microscopy of Germinal Centers
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球状星団の核の高解像度のX線画像: 47Tucのコンパクトバイナリ
J E Grindlay1, C Heinke, P D Edmonds
1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA. josh@cfa.harvard.edu
まとめ
チャンドラX線天文台は球状星団47ツカナエの画像を撮影し,コンパクトバイナリーの密集した集団を明らかにしました. ほとんどの源はミリ秒パルサー (MSP) と白矮星の収束であり,中性子星ではありません.
科学分野:
- 天文学と天体物理学について
- X線天文学 X線天文学
- 恒星群の集団について
背景:
- 球状星団は,密度の高い恒星系で,コンパクトな天体群を研究するためのユニークな環境を提供します.
- 球状星団のバイナリ群を理解することは,恒星の進化と動態にとって極めて重要です.
研究 の 目的:
- 球状星群47トゥカナエ (NGC 104) の高星密度の星核のコンパクトバイナリー群を調査する.
- 高解像度X線画像を用いてクラスター内のX線源の性質を特徴づける.
主な方法:
- チャンドラX線天文台 (70キロ秒曝光) を使用した47のトゥカナエの深層X線画像.
- X線スペクトルおよび時間特性の分析.
- ミリ秒パルサー (MSP) の無線観測と,ハッブル宇宙望遠鏡からの光学識別との相互相関.
主要な成果:
- 中央の2'×2.5'の範囲内で,少なくとも108の弱 X線源が中心に集まった集団が検出されました.
- 既知の15のミリ秒パルサー (MSP) がすべて特定され,そのうち13はチャンドラによって解明されました.
- >50%のMSP, ~30%の白矮星, ~15%の燃えるメインシーケンスバイナリー, 2-3の静止中の低質量X線バイナリーと推定されている.
- ~470太陽の質量の上限は,中央の黒穴に配置されました.
結論:
- この研究は,球状星団の最初のX線"色-大きさ"図を提供している.
- 47 Tucanaeのコンパクトオブジェクトとバイナリ集団の包括的な国勢調査が確立されました.
- この結果は,MSP形成の従来のモデルに異議を唱え,密度の高い恒星環境内の代替経路を示唆しています.
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