M51：潮汐流和h - α悬崖
(原标题: M51: Tidal Streams and H-alpha Cliffs)
2024-12-13
浏览次数: 17
M51是一对有趣的相互作用星系，是梅西耶著名星表中的第51个条目。也许最初的螺旋星云，这个几乎正面看到的漩涡状螺旋结构的大星系也被编目为NGC 5194。它的旋臂和尘埃带扫向它较小的伴星星系NGC 5195。M51距离我们大约3100万光年，位于训练有素的天藤星座的边界内，在直接的望远镜视野中，它看起来模糊而模糊。但这张非常深的照片展示了这对星系惊人的色彩和微弱的潮汐流的惊人细节。这张照片包含了大量的窄带数据，以突出显示最近在M51系统中发现的巨大的红色电离氢气云，有些人称之为h - α悬崖。前景的尘埃云在银河系和遥远的背景星系被捕获在宽视场视图。天文成像仪的持续合作，使用地球上的望远镜，在三周的曝光时间里，创造了M51的这幅不断变化的肖像。观看：2024年双子座流星雨
查看原文解释
An intriguing pair of interacting galaxies, M51 is the 51st entry in Charles Messier's famous catalog. Perhaps the original spiral nebula, the large galaxy with whirlpool-like spiral structure seen nearly face-on is also cataloged as NGC 5194. Its spiral arms and dust lanes sweep in front of its smaller companion galaxy, NGC 5195. Some 31 million light-years distant, within the boundaries of the well-trained constellation Canes Venatici, M51 looks faint and fuzzy to the eye in direct telescopic views. But this remarkably deep image shows off stunning details of the galaxy pair's striking colors and fainter tidal streams. The image includes extensive narrowband data to highlight a vast reddish cloud of ionized hydrogen gas recently discovered in the M51 system and known to some as the H-alpha cliffs. Foreground dust clouds in the Milky Way and distant background galaxies are captured in the wide-field view. A continuing collaboration of astro-imagers using telescopes on planet Earth assembled over 3 weeks of exposure time to create this evolving portrait of M51. Watch: The 2024 Geminid Meteor Shower
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