短いガンマ線爆発は,赤道偏移z = 0.225の円銀河と明らかに関連している

N Gehrels¹, C L Sarazin, P T O'Brien

¹NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.

Nature

|October 7, 2005

まとめ

研究者らは,円銀河の近くで,短いガンマ線爆発 (GRB),GRB 050509Bを観測した. この発見は,短いGRBは,中性子星やブラックホールの二重星が融合したときに発生するという理論を支持する.

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:

* ガンマ線爆発 (GRBs) は,長 (>2s) または短い,ハードイベントとして分類されます.
* 長いGRBは,しばしば高い赤偏移 (z~1) で,巨大な恒星の核崩壊から発生します.
* 短いGRBは,正確な,迅速な局所化は欠け,起源の研究を妨げました.

研究の目的:

* 短いガンマ線爆発GRB 050509Bを検知して位置づけます.
* ショートGRBの起源を特定し,その位置を特定する.
* 短いGRBを局所化する歴史的な困難を説明するために.

主な方法:

* 短いGRB 050509B.からのX線後の光が検出されました.
* GRB 050509Bが,正確な空の位置 (<10インチ) に位置づけられました.
* 厳格な上限を設定し,光学的な後光を探した.

主要な成果:

*GRB 050509Bは,赤道偏移z=0.225.9で恒星形成しない円銀河の近くに位置しました.
*X線後の光は薄弱で,数時間以内に急速に消えていった.
* 過去のローカライゼーションチャレンジと一致して,光学的な後光は検出されませんでした.

結論:

* GRB 050509Bの局所化は,二重結合起源 (中性子星またはブラックホール) を支持しています.
* 微弱で短命な後光は,短いGRBの急速な局所化の困難を説明します.
* この研究は,短いGRBの祖先に関する重要な観察的証拠を提供します.

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