GW170817のスウィフトとNuSTAR観測:青いキロノヴァの検出

P A Evans¹, S B Cenko^2,3, J A Kennea⁴

¹University of Leicester, X-ray and Observational Astronomy Research Group, Leicester Institute for Space and Earth Observation, Department of Physics and Astronomy, University Road, Leicester LE1 7RH, UK. pae9@leicester.ac.uk.

Science (New York, N.Y.)

|October 18, 2017

まとめ

この研究は,二重中性子星の合併GW170817の紫外線とX線観測を報告しています. これらの発見は,高質量流出を明らかにし,このような宇宙現象を観察するための最適な視角を示唆しています.

科学分野:

マルチメッセンジャー天体物理学
重力波天文学
コンパクトオブジェクトの合併

背景:

重力波 (GW) 天文学の誕生は 2015年のブラックホールの合併の検出によって明らかになった.
コンパクトなオブジェクトの合併を包括的に理解するために,電磁 (EM) の対称性の必要性.

研究の目的:

双重中性子星GW170817のEM対照の紫外線 (UV) とX線観測について報告する.
アウトフローの特性を特徴付け,合併イベントの視角を決定する.

主な方法:

スウィフトと核光譜望遠鏡配列 (NuSTAR) を利用して紫外線とX線観測を行った.
観測されたEMの光線とスペクトルの性質を分析した.
観測された放射能と理論モデルに基づいて視角を制限した.

主要な成果:

高質量 (≈0.03太陽質量) の流出に一致する,明るく,急速に消えていく紫外線放射を検出しました.
流出は中程度の電子分数を示した (Y_e ≈0.27).
紫外線データと組み合わせたX線観測は,軌道軸から約30°の観測角度を好みました.

結論:

観測された紫外線放射と好ましい観測角度は,重元素による遮蔽とガンマ線爆発の直視を回避する流出を示唆しています.
これらの発見は,二重中性子星の融合物理とその電磁対称性についてのより完全なイメージに貢献します.
この研究は,GWとEMの観測が宇宙の複雑さを解明する上で持つ相乗効果を強調しています

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