バイナリの中性子星の合併の結果として,マグネタール駆動のX線トランジエント
Y Q Xue1,2, X C Zheng3,4,5, Y Li6
1CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, China. xuey@ustc.edu.cn.
Nature
|April 12, 2019
まとめ
研究者らは,中性子星の合併によって形成されたミリ秒マグネタールによって動いている可能性のある第2のX線トランジント,CDF-S XT2を特定しました. この発見は 短いガンマ線爆発でも これらの宇宙現象と X線トランジタとの関連を 強化しています
科学分野:
- 天体物理学と天文学
- 高エネルギー天体物理学
- 重力波天文学
背景:
- 中性子星の融合は 短いガンマ線爆発 (GRB) と関連しています
- 合併により磁星が生成され,いくつかのGRB後に観測されるX線高原を放出する.
- 短時間GRBとは独立して発生する可能性がある.
研究 の 目的:
- 二重中性子星の合併から発生する可能性があるX線トランジエントの性質を調査する.
- 新しく発見されたX線変異体CDF-S XT2の性質を分析する.
- CDF-S XT2と中性子星の合併の関連を評価する.
主な方法:
- X線変異CDF-S XT2の観測と分析
- CDF-S XT2のホスト銀河の赤偏移測定 (z = 0.738)
- CDF-S XT2の光の曲線と空間分布を理論モデルと既知の天体物理現象と比較.
主要な成果:
- CDF-S XT2の光の曲線は,ミリ秒マグネタールによるパワーアップと一致しています.
- CDF-S XT2は,その恒星形成宿主銀河の郊外に位置し,短いGRBの祖先の位置に似ています.
- このような一時的な出来事の推定速度は,重力波検出から推論された二重中性子星の合併の速度と一致します.
結論:
- CDF-S XT2は,中性子星の合併から生じるミリ秒マグネタによって X線トランジエンスの強力な証拠を提供します.
- これらの事象は 関連した短いガンマ線爆発なしに起こるので 融合電磁対称性についての理解が広がります
- この発見は,二重中性子星の合併が観測されたX線トランジエントの重要な源であるシナリオを裏付けている.
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