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【人民日報】我國科學家首次證實 雙中子星合并可產生磁星

文章來源:人民日報 趙永新   發布時間:2019-04-12  【字號:     】  

圖為磁星假想圖。王國燕、何聰供圖

  由我國科學家主導的一項最新研究表明,雙中子星合并的產物是磁星,相關論文11日在線發表在《自然》雜志。

  該項研究的主要牽頭人、中國科學技術大學物理學院天文系教授薛永泉介紹,中子星是宇宙中最為神奇的天體之一,它幾乎全部由中子組成,具有超高密度、超強磁場等極端物理屬性,是檢驗基本物理規律極佳的天然實驗室。此前的主流觀點認為,其合并后的產物是黑洞。

  薛永泉等人發現了一個持續約7小時的X射線輻射信號,這個信號來自約66億光年外,各種關鍵觀測數據和理論分析均表明:該信號源于雙中子星合并之后產生的磁星。磁星為磁場特別強的星體,其表面磁場比目前人類實驗室能制造出來的最強磁場還強上億倍,同時具有超高的自轉速度,每秒自轉幾百到上千周,其離心力能幫助它短期抗衡自身產生的強大的引力,因而不會坍縮成黑洞。這一發現證實了雙中子星合并直接產物可以是大質量毫秒磁星,排除了一批核物質模型,為未來的引力波探測和中子星研究提供了新方向。

  (原載于《人民日報》 2019-04-12 12版)




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