NGC 7814：带超新星的小草帽
(原标题: NGC 7814: Little Sombrero with Supernova)
2021-07-22
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把你的望远镜对准飞马座，你就能看到这片浩瀚的银河系和遥远的星系。NGC 7814位于美丽的视野中心，几乎可以被满月覆盖。NGC 7814有时被称为小草帽，因为它与更明亮、更著名的草帽星系M104相似。宽边帽和小宽边帽都是螺旋星系，它们都有广泛的光晕和中央凸起，被一个薄薄的圆盘切割，轮廓上有更薄的尘埃带。事实上，NGC 7814距离我们约4000万光年，直径估计为6万光年。实际上，这使得“小草帽”的物理尺寸与其更为人所熟知的同名产品大致相同，只是因为距离更远，所以看起来更小、更暗淡。在这张7月17日的望远镜照片中，NGC 7814正拥有一颗新发现的超新星，位于星系核心的左侧。这颗恒星的编号为SN 2021rhu，已被确定为Ia型超新星，有助于校准宇宙的距离尺度。
查看原文解释
Point your telescope toward the high flying constellation Pegasus and you can find this expanse of Milky Way stars and distant galaxies. NGC 7814 is centered in the pretty field of view that would almost be covered by a full moon. NGC 7814 is sometimes called the Little Sombrero for its resemblance to the brighter more famous M104, the Sombrero Galaxy. Both Sombrero and Little Sombrero are spiral galaxies seen edge-on, and both have extensive halos and central bulges cut by a thin disk with thinner dust lanes in silhouette. In fact, NGC 7814 is some 40 million light-years away and an estimated 60,000 light-years across. That actually makes the Little Sombrero about the same physical size as its better known namesake, appearing smaller and fainter only because it is farther away. In this telescopic view from July 17, NGC 7814 is hosting a newly discovered supernova, dominant immediately to the left of the galaxy's core. Cataloged as SN 2021rhu, the stellar explosion has been identified as a Type Ia supernova, useful toward calibrating the distance scale of the universe.
© CHART32 Team