NGC 4753的扭曲盘
(原标题: The Twisted Disk of NGC 4753)
2024-12-31
浏览次数: 15
你觉得这是什么？给你个提示：它比面包盒还大。大得多。答案是，照片中的NGC 4753是一个扭曲的盘状星系，其中不寻常的暗尘埃细丝为其历史提供了线索。没有人能确定发生了什么，但一个主流模型认为，一个相对正常的盘状星系在旋转时，其进动扭曲了吸积碎片的平面，从而在引力作用下撕裂了一个尘土飞扬的卫星星系。据推测，这次宇宙碰撞始于大约10亿年前。从侧面看NGC 4753，从顶部看可能看起来像一个正常的螺旋星系。明亮的橙色光晕由许多可能追踪暗物质的老恒星组成。这张哈勃图像最近经过重新处理，突出了紫外线和红光的辐射。APOD年度回顾：NASA 2024年夜空网络演示
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What do you think this is? Here’s a clue: it's bigger than a bread box. Much bigger. The answer is that pictured NGC 4753 is a twisted disk galaxy, where unusual dark dust filaments provide clues about its history. No one is sure what happened, but a leading model holds that a relatively normal disk galaxy gravitationally ripped apart a dusty satellite galaxy while its precession distorted the plane of the accreted debris as it rotated. The cosmic collision is hypothesized to have started about a billion years ago. NGC 4753 is seen from the side, and possibly would look like a normal spiral galaxy from the top. The bright orange halo is composed of many older stars that might trace dark matter. The featured Hubble image was recently reprocessed to highlight ultraviolet and red-light emissions. APOD Year in Review: NASA Night Sky Network Presentation for 2024