半人马座A：一个奇特的星岛
(原标题: Centaurus A: A Peculiar Island of Stars)
2023-05-03
浏览次数: 13
星系是迷人的。在星系中，仅靠引力就能将大量恒星、尘埃、星际气体、恒星残骸和暗物质聚集在一起。这张照片是NGC 5128，更广为人知的名字是半人马座A。半人马座A是天空中第五亮的星系，距离地球约1200万光年。半人马座A的扭曲形状是椭圆星系和螺旋星系合并的结果。它的活动星系核拥有一个超大质量黑洞，其质量约为太阳的5500万倍。这个中心黑洞喷射出一种快速的喷流，在射电和x射线光下都能看到。喷流的细丝在左上方以红色可见。事件视界望远镜（Event Horizon Telescope）的新观测显示，喷流只在其边缘变亮，但原因目前尚不清楚，这是一个活跃的研究课题。在美国宇航局，这是：黑洞周
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Galaxies are fascinating. In galaxies, gravity alone holds together massive collections of stars, dust, interstellar gas, stellar remnants and dark matter. Pictured is NGC 5128, better known as Centaurus A. Cen A is the fifth brightest galaxy on the sky and is located at a distance of about 12 million light years from Earth. The warped shape of Cen A is the result of a merger between an elliptical and a spiral galaxy. Its active galactic nucleus harbors a supermassive black hole that is about 55 million times more massive than our Sun. This central black hole ejects a fast jet visible in both radio and X-ray light. Filaments of the jet are visible in red in the upper left. New observations by the Event Horizon Telescope have revealed a brightening of the jet only towards its edges -- but for reasons that are currently unknown and an active topic of research. At NASA it's: Black Hole Week
© Marco Lorenzi, Angus Lau & Tommy Tse; Text: Natalia Lewandowska (SUNY Oswego)