350 Mpcの長時間ガンマ線爆発後のキロノヴァ
Jillian C Rastinejad1,2, Benjamin P Gompertz3,4, Andrew J Levan5,6
1Center for Interdisciplinary Exploration and Research in Astrophysics, Northwestern University, Evanston, IL, USA. jillianrastinejad2024@u.northwestern.edu.
Nature
|December 8, 2022
まとめ
ガンマ線爆発 (GRB) 211211Aに関連したキロノヴァは,コンパクトなオブジェクトの合併が長いGRBを生成し,伝統的な分類に挑戦することを示唆しています. この発見はGRBを 重元素の形成の重要な場所である キロノヴァと結びつけています
科学分野:
- 天体物理学
- マルチメッセンジャー天文学
背景:
- ガンマ線爆発 (GRB) は通常,長い (巨大な星の崩壊から) または短い (コンパクトなオブジェクトの合併から) と分類されます.
- 持続時間による分類は不完全です. 拡張された放出 (EE-SGRB) のいくつかの短いGRBは,合併から発生する可能性があります.
- コンパクトなオブジェクトの融合は,観測可能なキロノバを生成する r プロセス核合成に不可欠です.
研究 の 目的:
- 1分間のGRB 211211Aの祖先を調査する
- GRB 211211Aがキロノヴァと関連しているかどうかを判断する
- GRB分類とマルチメッセンジャー天文学への影響を調査する.
主な方法:
- GRB 211211Aに関連したキロノヴァ放射の観測と分析.
- GW170817のような以前に観測されたキロノヴァの特性 (光度,持続時間,色) との比較.
- GRB 211211Aの特徴と潜在的な祖先モデルとの相関.
主要な成果:
- 近くのGRB 211211Aに関連したキロノヴァの発見.
- キロノバは,二重中性子星GW170817の合併によるキロノバと類似した性質を示している.
- この発見は,GRB 211211Aがコンパクトなオブジェクトの合併から生じたことを示唆しています.
結論:
- コンパクトなオブジェクトの融合は 長い複雑な光の曲線を持つガンマ線爆発を生成します
- GRBの伝統的な持続時間に基づく分類は,その祖先を正確に反映していないかもしれません.
- 長いGRBと一致する重力波信号の将来的な検索は,マルチメッセンジャー天文学にとって不可欠です.
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