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銀河系M85の異常な輝きのあるトランジタ
S R Kulkarni1, E O Ofek, A Rau
1Caltech Optical Observatories, California Institute of Technology, California 91125, USA. srk@astro.caltech.edu
Nature
|May 25, 2007
まとめ
天文学者は,メッシエ85銀河系で,明るい光学トランジントであるM85 OT2006-1を発見しました. この恒星の合併イベントは,新星よりも明るく,超新星よりも弱く,恒星の進化に関する新しい洞察を提供します.
科学分野:
- 天文学 (astronomy) 天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは
- 天体物理学 天体物理学
- コスミック・トランシエンツ
背景:
- 変数的で一時的な天文学的情報源は,宇宙に関する新しい視点を提供します.
- メシア85のようなレンズ状銀河は,通常,より古い恒星で満たされ,異常な一時的な出来事を注目に値します.
研究 の 目的:
- 重要な光学トランジエント,M85 OT2006-1.の発見と初期特徴を報告する.
- この異常な天体現象の性質と潜在的な起源を調査する.
主な方法:
- メシア85銀河の光学トランジエントの観測.
- そのピーク絶対Rの大きさとエネルギー出力の分析.
- 新星や超新星のような既知の天文学的変異体との比較.
- 輝く青色の変数星の噴火のような可能性を排除するために,アーカイブ画像の調査.
主要な成果:
- メシア85.5の光学トランジタであるM85 OT2006-1の発見
- ピークの絶対Rマグニチュードは-12で,新星よりも明るく,タイプIア超新星よりも弱くなります.
- 2ヶ月の合計放射エネルギーは,約10^47 ergである.
- トランジントはピーク後,光学的に色あせました.
- イベントはM31.1.の類似のトランジントよりも6倍明るく輝く.
結論:
- M85 OT2006-1は,典型的な恒星爆発とは異なるユニークな一時的な出来事です.
- 星の合併は,観測された性質の妥当な説明である.
- 類似のイベントのさらなる探求は,ハイパーエディントン源と恒星の二重進化を照らすことができます.
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