M82の超光るX線源の軌道周期
Philip Kaaret1, Melanie G Simet, Cornelia C Lang
1Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City, IA 52242, USA. philip-kaaret@uiowa.edu
まとめ
銀河M82の超輝かしいX線源 (ULX) は,中等質量ブラックホールである可能性がある. その62日間の軌道周期は,巨大な恒星ドナーを示唆し,一時的な進化段階を示しています.
科学分野:
- * 天体物理学
- * 天文学 (アストロノミー)
- *X線天文学のX線
背景:
- *超光るX線源 (ULXs) は,恒星質量ブラックホールのエディントン限界を超える輝度を持つ点状X線源である.
- *銀河M82は,中質量ブラックホール (IMBH) の潜在的な候補である顕著なULXをホストしています.
- * 超恒星群は,強烈な星形成とダイナミックな相互作用の場であり,IMBH形成につながる可能性がある.
研究 の 目的:
- *M82.2におけるULXの性質を調査する.
- * ULXバイナリーシステムの軌道周期と特徴を決定する.
- * コンパクトな物体とその同伴者の質量と進化状態を制限する.
主な方法:
- *M82.2からのX線流量調節の分析.
- *X線放射の周期性を決定する.
- * バイナリー進化の文脈における軌道周期の解釈.
主要な成果:
- * M82 ULXからのX線流は,著しい調節を示している.
- *62.0 ± 2.5日の周期が特定され,軌道周期として解釈されました.
- * 推論された軌道周期は,質量ドナー星が巨大または超巨大であることを示唆しています.
結論:
- * M82 ULXはX線バイナリ系で,中等質量ブラックホールがある可能性が高い.
- * 伴星は巨大期にあり,高質量移転率を経験しています.
- *観測されたULXは,バイナリーの進化の短い,異常な段階を表しています.
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