銀河系中心的棒狀結構

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銀河系可能是我們自己的星系鄰居,但它仍然有一些驚喜等待著我們。例如說:有史以來對銀河系進行的最全面的結構分析表明我們的銀河系畢竟不是一個普通的螺旋星系。

天文學家使用 NASA 的紅外斯皮策太空望遠鏡對銀河系中約 3000 萬顆恆星的光進行取樣,觀察到銀河系中心有一個由相對較老的恆星組成的長棒狀結構橫跨銀河系中心。已知棒狀結構存在於其他一些螺旋星系中,研究人員長期以來一直在思考我們的星系中可能也存在棒狀結構。然而,他們不確定銀河系中心會包含棒狀結構、橢圓結構還是兩者兼有。

新的觀測結果描繪了迄今為止最清晰的銀河系內部影像,並以前所未有的細節揭示了明顯的棒狀結構。這個棒狀結構的長度約為 27,000 光年(比預期長 7,000 光年),並且以 45 度角傾斜於銀河系的主平面。


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“到目前為止,這是我們星系中存在長棒狀結構的最好證據,”威斯康星大學白水分校的羅伯特·本傑明說。本傑明和他的同事在一篇論文中描述了這項工作,該論文計劃在即將出版的《天體物理學雜誌通訊》上發表。

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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