ngc1947的线索
(原标题: Threads of NGC 1947)
2021-04-07
浏览次数: 7
ngc1947位于遥远的南方天空，在多拉多星座的边界深处，距离我们大约4000万光年。在星光的映衬下，模糊的宇宙尘埃线穿过这个特殊星系明亮的中心区域。与螺旋星系臂上的恒星、气体和尘埃的旋转不同，ngc1947中尘埃和气体的运动并不跟随恒星的运动。它们更复杂的分离运动表明，这个星系可见的尘埃和气体线可能来自一个供体星系，在过去30亿年左右的特殊星系演化过程中被ngc1947吸积。这张清晰的哈勃图像在ngc1947中心附近，跨度约25000光年，画面中布满了前景尖尖的银河系恒星和更远的背景星系。
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Found in far southern skies, deep within the boundaries of the constellation Dorado, NGC 1947 is some 40 million light-years away. In silhouette against starlight, obscuring lanes of cosmic dust thread across the peculiar galaxy's bright central regions. Unlike the rotation of stars, gas, and dust tracing the arms of spiral galaxies, the motions of dust and gas don't follow the motions of stars in NGC 1947 though. Their more complicated disconnected motion suggest this galaxy's visible threads of dust and gas may have come from a donor galaxy, accreted by NGC 1947 during the last 3 billion years or so of the peculiar galaxy's evolution. With spiky foreground Milky Way stars and even more distant background galaxies scattered through the frame, this sharp Hubble image spans about 25,000 light-years near the center of NGC 1947.