M82：带超级风的星暴星系
(原标题: M82: Starburst Galaxy with a Superwind)
2021-07-09
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M82是一个有超风的星暴星系。事实上，通过随后的超新星爆炸和来自大质量恒星的强大气流，M82中恒星形成的爆发正在推动巨大的外流。来自星系中心区域的超级风的证据在清晰的望远镜快照中清晰可见。这幅合成图像突出显示了原子氢气长流出细丝发出的红色。超级风中的一些气体，富含在大质量恒星中形成的重元素，最终会逃逸到星系间空间。由与附近大星系M81的近距离接触引发，M82中恒星形成的猛烈爆发应该持续大约1亿年左右。M82也因其细长的视觉外观而被称为雪茄星系，其直径约为30,000光年。它位于1200万光年远的大熊座北部边界附近。
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M82 is a starburst galaxy with a superwind. In fact, through ensuing supernova explosions and powerful winds from massive stars, the burst of star formation in M82 is driving a prodigious outflow. Evidence for the superwind from the galaxy's central regions is clear in sharp telescopic snapshot. The composite image highlights emission from long outflow filaments of atomic hydrogen gas in reddish hues. Some of the gas in the superwind, enriched in heavy elements forged in the massive stars, will eventually escape into intergalactic space. Triggered by a close encounter with nearby large galaxy M81, the furious burst of star formation in M82 should last about 100 million years or so. Also known as the Cigar Galaxy for its elongated visual appearance, M82 is about 30,000 light-years across. It lies 12 million light-years away near the northern boundary of Ursa Major.
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