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フェルミによって検出された,新たに加速した宇宙線のは,シグナスの超大気泡にある
M Ackermann1, M Ajello, A Allafort
1W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA.
Science (New York, N.Y.)
|November 26, 2011
まとめ
科学者たちは,フェルミ大型望遠鏡 (LAT) を使用して若い宇宙線を観測しました. これらの高エネルギー粒子はCygnus X領域の空洞を浸し,より広い銀河に加わる前に彼らの初期の旅の洞察を提供します.
科学分野:
- 天体物理学 天体物理学
- 宇宙線物理学 宇宙線物理学
- 高エネルギー天文学 高エネルギー天文学
背景:
- 銀河系宇宙線の起源は,天体物理学における長年の謎のままである.
- 超新星衝撃波は加速器であると疑われるが,これらの源からの宇宙線の脱出と進化はほとんど理解されていない.
- ガンマ線天文学は,恒星間ガスと放射線場を通じた宇宙線の拡散を追跡する方法を提供しています.
研究 の 目的:
- 恒星形成地域における初期の生命と宇宙線の分布を調査する.
- ガンマ線観測を用いて,宇宙線の逃れと,巨大な恒星の周辺の進化を研究する.
- スーパーバブル環境における宇宙線の行動に関するケーススタディを提供するため.
主な方法:
- フェルミ大面積望遠鏡 (LAT) を使用したCygnus X星形成領域の観測.
- 1~100ギガ電子ボルトのガンマ線画像を分析して,宇宙線分布の地図を作成する.
- ガンマ線放射と,恒星風やイオン化フロントによって彫られた構造との相関.
主要な成果:
- Cygnus X.の内部で50パーセック幅の新加速宇宙線のを発見した.
- これらの宇宙線が,若い恒星群のエネルギッシュな流出によって作られた空洞を埋める証拠です.
- 密度の高い環境における宇宙線拡散と相互作用を理解するための探査機としてのガンマ線の実証.
結論:
- Cygnus X領域は,若い,新しく加速した宇宙線の有意な集団をホストしています.
- これらの宇宙線は,巨大な星の活動によって形成された領域に住んでいることが観察されています.
- この研究は,宇宙線が一般の銀河集団に拡散する前に,宇宙線の初期の進化へのユニークな窓を提供します.
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