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赤い偏移1で宇宙を探査する光速のラジオバースト
S D Ryder1,2, K W Bannister3, S Bhandari4,5
1School of Mathematical and Physical Sciences, Macquarie University, Sydney, NSW 2109, Australia.
Science (New York, N.Y.)
|October 19, 2023
まとめ
研究者らは,複雑な銀河系からの高速電波爆発 (FRB) を観測し,赤偏移-分散の測定関係を拡張しました. この研究では,FRB 20220610Aの観測に基づく最大エネルギーが修正されています.
科学分野:
- 天文学と天体物理学
- 宇宙学
- プラズマ物理学
背景:
- FRBはミリ秒間の謎の 銀河外無線電波です
- FRBの分散測定法 (DM) は,主に銀河間媒質 (IGM) の間隔プラズマに関する洞察を提供します.
- FRB赤偏移とDMの関係を理解することは 宇宙の構造とプラズマの分布を調査するために不可欠です
研究 の 目的:
- FRB20220610Aの観測と位置づけをするため
- プラズマとホスト銀河の特性を調べるため
- FRBの最大エネルギー推定を精査する.
主な方法:
- ラジオ天文学の観測を用いてFRB 20220610Aを宿主銀河系に位置づけました.
- 爆発の分散量と赤偏移の分析
- 爆発のエネルギーの見積もり
主要な成果:
- FRB 20220610Aは,複合的な宿主銀河系に1.016 ± 0.002の赤偏移で局所されました.
- 観測された分散量と赤色偏移は,以前から確立されたDM-赤色偏移関係を拡張して,有意なIGMプラズマを通過したものと一致しています.
- 証拠によると 爆発は渦巻く磁気質の プラズマを通過し 宿主銀河と 繋がっている可能性もある
- 爆発エネルギーは2 × 10^42 ergと決定された.
結論:
- FRB 20220610Aは,IGMと複雑な銀河外環境におけるプラズマ分布を理解するための貴重なデータを提供します.
- この発見は,銀河外源における分散量と赤偏移の相関を裏付け,拡張している.
- FRBの最大エネルギーの見積もりは,FRBの原発と放出メカニズムのモデルに影響を及ぼします.
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