哈勃望遠鏡一瞥:躁動不安的幼年恆星

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圖片來源:NASA/ESA哈勃太空望遠鏡

就像讓父母整夜難眠的人類新生兒一樣,恆星嬰兒也可以隨心所欲地塑造其母體氣體雲。根據美國宇航局哈勃太空望遠鏡對附近星系大麥哲倫星雲中一個恆星形成區域的新觀測,來自巨大、超亮的新生恆星的強烈輻射和強勁星風塑造了它們的環境,在它們的原始星雲N83B中雕刻出一個巨大的空腔。

在右側的影像中,這些大質量恆星正如它們從氣體“子宮”中誕生時所見。(這種觀測機會非常罕見,因為這些重量級的新生恆星成熟迅速,並且它們的大部分幼年時期都隱藏在塵埃中。)特別令人感興趣的是星雲中心的一顆恆星,就在最亮區域的下方,它強烈的光芒和狂暴的星風似乎已經驅散了周圍的氣體,形成了一個球形空洞,這個空洞可能只有3萬年的歷史——以天文標準來看,這相當年輕。星雲中相鄰的恆星——包括一顆質量是太陽45倍的恆星——都更年輕。中心恆星的強勁星風可能觸發了它們的形成。


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到目前為止,已經在N83B中探測到大約20顆明亮的年輕恆星。但其他恆星可能也存在於那裡以及大麥哲倫星雲的其他地方,在宇宙塵埃的面紗後踢打和尖叫。

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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