ラジオ銀河M87からのテラ電子ボルトのガンマ線の急速な変動
F Aharonian1, A G Akhperjanian, A R Bazer-Bachi
1Max-Planck-Institut für Kernphysik, Post Office Box 103980, D 69029 Heidelberg, Germany.
Science (New York, N.Y.)
|October 28, 2006
まとめ
ラジオ銀河M87からのテラ電子ボルト (TeV) ガンマ線流の急速な変動は,そのブラックホール近くのコンパクトな放射領域を示唆しています. この発見は,他の生産現場を除外し,ブラザーを超えた銀河外のTeVガンマ線源を確認しています.
科学分野:
- 高エネルギー天体物理学
- ガンマ線天文学のガンマ線天文学
- 銀河系外天文学とは
背景:
- ラジオ銀河M87は高エネルギー現象の源である.
- テラ電子ボルト (TeV) ガンマ線の起源を理解することは,天体物理学にとって極めて重要です.
- 以前の観測では,銀河外の源からのガンマ線流の変動が遅いことが示されていた.
研究 の 目的:
- M87.7からのTeVガンマ線流の急速な変動の検出を報告する.
- これらの急速な変動が排出地域サイズに及ぼす影響を調査する.
- 銀河外源におけるガンマ線生成のモデルを制約する.
主な方法:
- M87からのTeVガンマ線放射の観測と分析.
- ガンマ線流量変動の時間スケール分析.
- 変動時間スケールの他の波帯と理論モデルとの比較.
主要な成果:
- M87.7からのTeVガンマ線流の急速な (昼間の) 変動の検出
- これらの変動は,他の波帯で以前に観測されたものより約10倍速い.
- 急速な変動は,M87の中央のブラックホールのシュワルツシルト半径に匹敵する非常にコンパクトな放射領域を暗示しています.
結論:
- コンパクトな放射領域は,ガンマ線生成のためのいくつかの提案されたサイトとプロセスを除外しています.
- この発見は,TeVのガンマ線が,ブラザール以外の銀河外の源から放出される可能性があることを確認した.
- これは,相対論的に観測者に向かって照射されていないジェットを持つ源からのTeVガンマ線放射の存在を支持する.
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