タイプIa超新星2007onの祖先の発見
1Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, 85748, Garching, Germany. rvoss@mpe.mpg.de
Nature
|February 15, 2008
まとめ
研究者らは,超新星発生前のX線源を特定し,タイプIア超新星発生の祖先であると考えられる. この発見は,宇宙学にとって極めて重要なこれらの宇宙爆発の蓄積モデルを支持する.
科学分野:
- * 天体物理学 * 天体物理学
- * 宇宙学 (コスモロジー)
- * 恒星の進化について
背景:
- *タイプIア超新星は,宇宙距離の重要な指標であり,主要な鉄の生産者です.
- *Iア型超新星の正確な原始系と爆発メカニズムについては,まだ議論が続いている.
- *現在のモデルには,単一白矮星の質量増加と二重白矮星の合併が含まれています.
研究 の 目的:
- *タイプIア超新星の祖先系を特定するために.
- *提案されているタイプIア超新星原型モデルを区別するために.
- * 精密宇宙学への影響を評価する.
主な方法:
- * 超新星前の物体の位置を特定するために,アーカイブX線画像データの分析.
- *X線源の位置と深層光学アーカイブ画像の比較.
- * 発見と,恒星の進化と超新星についての理論的モデルとの相関.
主要な成果:
- * 2007年10月IA型超新星発生地における超新星発生前のX線源の発見
- * 深い光学画像に該当するオブジェクトがない.
- * 先祖の宿主銀河の年齢は,いくつかの蓄積モデルによって予測されたより古い.
結論:
- * 特定されたX線源は,おそらく超新星2007on.の祖先である.
- *この発見は,この特定のタイプIa超新星に対する白矮星増殖モデルを支持する強力な証拠を提供します.
- * 年齢の差異は,より古い恒星群の蓄積モデルに必要な潜在的精錬を示唆しています.
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