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球状星群における反復的な高速電波源
F Kirsten1,2, B Marcote3, K Nimmo4,5
1Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, Sweden. kirsten@astron.nl.
Nature
|February 24, 2022
まとめ
球状星団に局限した高速電波 (FRB) は,既存のモデルに挑戦しています. この発見は,FRBは,白矮星の崩壊や,これらの密度の高い恒星環境内の二重結合によって形成された中性子星から生じる可能性があることを示唆しています.
科学分野:
- 天体物理学
- ラジオ天文学
背景:
- FRBは謎めいた銀河外無線電流で 起源は不明です
- ほとんどのFRBは単一の出来事ですが,いくつかのリピターが観察され,様々な理論的モデルに導かれています.
- マグネタールはFRBの源として頻繁に提案されています.
研究 の 目的:
- 繰り返される ラジオバースト 20200120E の起源を調査する
- 新しい観測データに対して既存のFRB生成モデルをテストする.
主な方法:
- ラジオ望遠鏡観測によるFRB 20200120Eの位置づけ
- 近くの銀河系M81にある球状星団とFRB源の関連性.
- 古い恒星集団内の源の位置の影響を分析する.
主要な成果:
- FRB 20200120Eは,M81の球状星団に正確に位置し,その光学中心から約2パーセクです.
- 古い恒星集団で知られている球状星団内の位置は,超新星から若い磁星を必要とするモデルと矛盾しています.
結論:
- 観測されたFRBの位置は,コア崩壊の超新星で形成された若い磁星に基づくモデルに挑戦しています.
- 代替モデルでは,FRB 20200120Eは,白矮星の蓄積誘発による崩壊または二重星系におけるコンパクトな星合併によって形成された高度に磁性化された中性子星から発生すると示唆している.
- 球体群のコンパクトバイナリーの高頻度は,これらの代替的形成シナリオをサポートしています.
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