プラズマレンズによって増幅され,解消されたパルサー放射
Robert Main1,2,3, I-Sheng Yang4,5, Victor Chan6
1Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON, Canada. main@astro.utoronto.ca.
Nature
|May 26, 2018
まとめ
放射パルサーは宇宙のレンズとして作用し 天文学者が放射領域の解明を可能にします ブラック・ウィドウパルサーB1957+20における極端なプラズマレンズ現象は,パルサーの放射に関する詳細を明らかにし,急速な無線爆発の理論を支持する.
科学分野:
- * 天体物理学
- * ラジオ天文学
- * プラズマ物理学
背景:
- * 電波パルサーは,電離された恒星間介質を介して伝播されるため,スシンチレーションを示す.
- * 星間シンチレーション領域は,パルサー放射の局所化のための"星間レンズ"として機能することができます.
- * 以前の研究は,排出成分をわずかに解明し,推論を制限した.
研究 の 目的:
- * ブラック・ウィドウパルサー (B1957+20) の極端なプラズマレンズ現象を調査する.
- * パルサー発射領域の高解像度イメージングのためにこれらのレンズイベントを利用する.
- * 急速無線爆発 (FRB) を理解するための意味を探求する.
主な方法:
- * ブラック・ウィドウパルサーB1957+20の観測
- * 極端なプラズマレンズ化イベント中の無線流増強の分析.
- * レンズによる周波数依存構造の特徴
主要な成果:
- * 極度のプラズマレンズ化現象が観測され,放射流の強化が70~80倍に達した.
- * 決まったパルサー放射領域,メインパルスとインターパルスを区別する.
- * 推論されたレンズの解像度はパルサーの半径 (~10 km) と比較できます.
- * FRB 121102で観測されたものと同様の周波数構造が見つかりました.
結論:
- *B1957+20の極端なプラズマレンズは,同伴者の流出の密度の変動から自然に発生します.
- *観測されたレンズは,FRBの"恒星間レンズ"モデルのための強力な証拠を提供します.
- * この研究は,高解像度パルサー天文学のプラズマレンズ化の可能性を実証しています.
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