マイクロクワザール SS 433 のジェットで動いている非常に高エネルギー粒子加速器

A U Abeysekara¹, A Albert², R Alfaro³

¹Department of Physics and Astronomy, University of Utah, Salt Lake City, UT, USA.

Nature

|October 5, 2018

まとめ

高エネルギーガンマ線観測により,SS 433/W50系は

科学分野:

天体物理学
高エネルギー天体物理学
粒子天体物理学

背景:

SS 433は,超巨大星がコンパクトな物体に収束し,強力なジェットを生成するマイクロクワザールです.
これらのジェットは W50超新星残骸と相互作用し歪みや粒子加速を引き起こします
以前の研究では,より高いエネルギー (100 GeV以上) で放出メカニズム (電子対陽子) に関して曖昧な結果が得られた.

研究の目的:

SS 433/W50システムからの高エネルギーガンマ線放射の起源を調査する.
W50のロブ内の放射領域を空間的に解明する.
観測された放射線に起因する支配的な粒子集団とエネルギー範囲を決定する.

主な方法:

SS 433/W50システムを研究するためにテラエレクトロンボルト (TeV) ガンマ線観測を用いた.
W50の残骸を空間的に解明する技術を使いました.
少なくとも25TeVまでの光子エネルギーを分析し,システムの観測幾何学を考慮した.

主要な成果:

中央のSS 433バイナリから遠く離れたW50の葉の構造に定着したTeVガンマ線放射を検出した.
測定された光子のエネルギーは少なくとも25TeVに達し,ドップラー増強されていない放射を確認します.
観測された放射は,広いエネルギー範囲 (電波からTeV) で,単一の電子集団と一致する.

結論:

SS 433/W50からの放射は,少なくとも数百TeVに加速された電子から発生します.
これらのエネルギッシュな電子は,W50の葉に約16マイクロガウスの磁場内に存在します.
この発見は,このマイクロクワザールシステムの放出メカニズムを明らかにし,陽子の代わりに電子に起因します.

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