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集積する中性子星のバイナリトランジエントからの持続的な紫外線流出
N Castro Segura1, C Knigge2, K S Long3,4
1Department of Physics & Astronomy, University of Southampton, Southampton, UK. N.Castro-Segura@soton.ac.uk.
Nature
|March 3, 2022
まとめ
研究者らは ニュートロン星双星 スウィフトJ1858.6-0814で 紫外線と光学風線を発見しました この発見は,硬い状態の間,蓄積円盤からの持続的な多相流出を示しています.
科学分野:
- 天体物理学
- アクレション物理学
- スター進化
背景:
- 中性子星やブラックホールのような 円盤が収縮する物体は 強力な円盤風を生成します
- X線吸収線のような風のサインは,柔らかな状態で観察され,光線は硬い状態で現れる.
- これらの風のシグネチャーの間のつながりは,異なる蓄積状態とスペクトル帯の間で不明のままです.
研究 の 目的:
- 蓄積爆発中の異なるスペクトル帯 (X線,紫外線,光学) のディスク風のシグネチャー間の関係を調査する.
- 紫外線領域で風が形成した線を特定し,特徴づけ,X線と光学観測の間のギャップを埋める.
- 中性子星の二重星系における 円盤流出の性質と振る舞いを理解する.
主な方法:
- 瞬時の中性子星バイナリスウィフトJ1858.6-0814の時間解像度の紫外線スペクトロスコーピー.
- 同時に観測された光学スペクトル線の分析.
- 紫外線スペクトルのデータを定数と変数に分解して,流出特性を分離する.
主要な成果:
- 紫外線スペクトルにおけるC IV,N V,He IIの風によって形成された,青にシフトした吸収線の検出.
- 同時に観測された光線における一時的なブルーシフト吸収の特定.
- 紫外線吸収のブルーシフトと恒定成分との関連は,発光から独立した流出を示唆しています.
結論:
- 紫外線と光学風の特徴の同時存在は,外側の蓄積円盤からの多相および/または空間的に層化された蒸気流出を示します.
- この流出は,放射線-水力学シミュレーションからの予測と一致する,異なる蓄積状態における持続的な特徴である可能性が高い.
- 観測された持続的な質量損失は,このようなシステムにおける蓄積爆発の比較的短い期間を説明するのに寄与する可能性があります.
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