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イオン化されたガスは,奇妙な無線円の宿主銀河で40kPaを超えています
Alison L Coil1, Serena Perrotta2, David S N Rupke3
1Department of Astronomy and Astrophysics, University of California, La Jolla, CA, USA. acoil@ucsd.edu.
Nature
|January 9, 2024
まとめ
奇妙な無線円 (ORC) は神秘的な天文物です. 観測データによると 銀河の中心部に 有電化ガスが存在し 光と電波の放出は 劇的な出来事によるものだと考えられます
科学分野:
- 銀河外天文学
- 銀河の進化
- 宇宙現象
背景:
- 奇妙な無線円 (ORC) は,巨大で薄く,拡散した無線放射のリングによって特徴づけられる新発見の銀河外無線源である.
- ORCの起源は不明であるが,関連する銀河は,ラジオ構造の大きな物理的スケールを示す赤偏移を持っている.
研究 の 目的:
- ORC4の中央銀河のスペクトロスコピクデータを分析することによって,ORCの性質を調査する.
- 中心銀河からの光学放射が ORC の大規模な無線放射と関連しているかどうかを判断する.
主な方法:
- ORC4内の中央銀河のスペクトロスコピーデータを取得し,分析した.
- イオン化されたガスの範囲,速度グラデント,速度分散,および[O II]等価の幅を測定した.
主要な成果:
- ORC4の中央銀河のイオン化されたガスの強い[O II]放射を z=0.4512で検出した.
- [O II]放射は ~40 kpcの範囲に広がり,静止している銀河にとって例外的に高い相当幅の速度グラデーションと高速分散を示している.
- 観測された形状,動力学,そして放出力は,外向きに動く衝撃の後に, 落下するショックイオン化されたガスと一致する.
結論:
- 観測された[O II]放出は 銀河の近くで衝撃イオン化されたガスが 劇的な出来事を示唆している.
- ORCの拡張光学および無線放射は,非常に異なるスケールにもかかわらず,同じエネルギーイベントから発生する可能性があります.
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