钱德拉揭示银河系背后长期寻找的X射线源

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天文学家长期以来一直想知道银河系平面中神秘的X射线辉光来自哪里。现在,发表在最新一期《科学》杂志上的新证据可能有助于解决这个问题。根据该报告,使用美国宇航局钱德拉X射线天文台的研究人员已将这种辐射追溯到一种炽热的弥散气体。

美国宇航局戈达德太空飞行中心的健·惠比泽(Ken Ebisawa)和他的同事们专注于盾牌座中银河系平面的一个小区域。钱德拉探测到一个弥散辐射,而不是X射线点源,从而探测了所谓的“回避区”——一个因没有对其进行光学观测而得名的空间区域。研究人员解释说,这表明X射线辉光来自集中在银河系平面上的极热等离子体气体。

该团队还在平面之外探测到36个新的遥远X射线点源。他们认为,这些是在我们银河系背后数百万光年之外的活动星系。

Kate Wong is an award-winning science writer and senior editor at 大众科学 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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