X線フラッシュXRF 06021818に関連した光学超新星
E Pian1, P A Mazzali, N Masetti
1Istituto Nazionale di Astrofisica, Trieste Astronomical Observatory, via G. B. Tiepolo 11, I-34131 Trieste, Italy. pian@oats.inaf.it
Nature
|September 1, 2006
まとめ
この研究は,X射線閃光 (XRF) をより軽い超新星と関連付け,ガンマ射線爆発 (GRB) と超新星との既知の関連を拡大しています. これは,本質的に弱いXRFイベントが,これまで考えられていたよりも一般的であることを示唆しています.
科学分野:
- * 天体物理学 * 天体物理学
- * 高エネルギー天体物理学
- * 観測宇宙学について
背景:
- * 長期ガンマ線爆発 (GRB) は,通常,高速度で物質を放出する光るタイプIc超新星と関連しています.
- * 光量が少ない超新星は,以前はGRBと関連付けられていなかったため,GRB超新星は稀であると考えられる.
- * 超新星とX線閃光 (XRF) の関連性とその性質 (本質的に弱い対オフ軸のGRB) は不明のままでした.
研究 の 目的:
- *X線閃光と超新星との関連を調査する.
- *XRFが本質的に弱い出来事なのか,あるいは軸外で見る古典的なGRBなのかを判断する.
- *GRB超新星連結を弱体化イベントに拡張する.
主な方法:
- *超新星SN 2006ajの光学発見とフォローアップ観測.
- * 射出速度を判定するためのスペクトル分析.
- * XRF 060218.8.0の既存の無線およびX線観測と光学データの統合
主要な成果:
- *XRF 060218に関連した超新星SN 2006ajは,典型的なGRB超新星よりも明るくはないが,GRBのない超新星よりも明るく見える.
- * SN 2006aj のエジェクタ速度は中位であり,弱小なGRB出力と無線流量と一致しています.
- *データによると,XRF 060218は本質的に弱くて柔らかいイベントであり,軸外GRBではありません.
結論:
- * GRBと超新星との関連は,X線閃光とより軽い超新星を含むように拡張されています.
- *XRF 060218は本質的に弱いイベントであり,以前の仮定に異議を唱える.
- *XRF 060218のような現象は,古典的なGRB超新星よりも一般的であり,共通の起源を暗示しています.
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