螺旋星系ngc6744
(原标题: Spiral Galaxy NGC 6744)
2024-11-01
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巨大而美丽的螺旋星系NGC 6744直径近17.5万光年，比我们的银河系还要大。它位于距离我们约3000万光年远的南天宫星座，但在小型望远镜的目镜中看起来只是一个模糊的污点。在这张非常深而详细的星系肖像中，我们看到附近岛屿宇宙的圆盘向我们的视线倾斜，这是一张望远镜图像，它横跨了一个满月大小的区域。在这幅图中，这个巨大星系细长的淡黄色核心被古老、凉爽的恒星发出的光所主导。在核心之外，巨大的旋臂充满了年轻的蓝色星团，点缀着粉红色的恒星形成区域。左上角，一条延伸的臂扫过较小的卫星星系NGC 6744A。NGC 6744的伴星让人想起了银河系的卫星星系大麦哲伦星云。
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Big, beautiful spiral galaxy NGC 6744 is nearly 175,000 light-years across, larger than our own Milky Way. It lies some 30 million light-years distant in the southern constellation Pavo but appears as only a faint smudge in the eyepiece of a small telescope. We see the disk of the nearby island universe tilted towards our line of sight in this remarkably deep and detailed galaxy portrait, a telescopic image that spans an area about the angular size of a full moon. In it, the giant galaxy's elongated yellowish core is dominated by the light from old, cool stars. Beyond the core, grand spiral arms are filled with young blue star clusters and speckled with pinkish star forming regions. An extended arm sweeps past smaller satellite galaxy NGC 6744A at the upper left. NGC 6744's galactic companion is reminiscent of the Milky Way's satellite galaxy the Large Magellanic Cloud.
© John Hayes