錢德拉揭示銀河系背後長期尋找的X射線源

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天文學家長期以來一直想知道銀河系平面中神秘的X射線輝光來自哪裡。現在,發表在最新一期《科學》雜誌上的新證據可能有助於解決這個問題。根據該報告,使用美國宇航局錢德拉X射線天文臺的研究人員已將這種輻射追溯到一種熾熱的彌散氣體。

美國宇航局戈達德太空飛行中心的健·惠比澤(Ken Ebisawa)和他的同事們專注於盾牌座中銀河系平面的一個小區域。錢德拉探測到一個彌散輻射,而不是X射線點源,從而探測了所謂的“迴避區”——一個因沒有對其進行光學觀測而得名的空間區域。研究人員解釋說,這表明X射線輝光來自集中在銀河系平面上的極熱等離子體氣體。

該團隊還在平面之外探測到36個新的遙遠X射線點源。他們認為,這些是在我們銀河系背後數百萬光年之外的活動星系。

Kate Wong is an award-winning science writer and senior editor at 大眾科學 focused on evolution, ecology, anthropology, archaeology, paleontology and animal behavior. She is fascinated by human origins, which she has covered for more than 25 years. Recently she has become obsessed with birds. Her reporting has taken her to caves in France and Croatia that Neandertals once called home, to the shores of Kenya's Lake Turkana in search of the oldest stone tools in the world, to Madagascar on an expedition to unearth ancient mammals and dinosaurs, to the icy waters of Antarctica, where humpback whales feast on krill, and on a "Big Day" race around the state of Connecticut to find as many bird species as possible in 24 hours. Kate is co-author, with Donald Johanson, of Lucy's Legacy: The Quest for Human Origins. She holds a bachelor of science degree in biological anthropology and zoology from the University of Michigan. Follow Wong on X (formerly Twitter) @katewong

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