螺旋星系NGC 1512：宽视场
(原标题: Spiral Galaxy NGC 1512: Wide Field)
2026-02-04
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大多数星系都没有环——为什么这个星系有三个环？首先，NGC 1512中心附近的一个环——在这里很难看到——是核环，它与新形成的恒星一起发出明亮的光。接下来是一个由恒星和尘埃组成的环，呈红色和蓝色，被称为内环，这与直觉相反。这个内环连接着横贯银河系的星团的两端。在这张广角图像中，最远处是一个粗糙的结构，可能被认为是一个外环。这个外环呈螺旋状，点缀着明亮的蓝色恒星团。所有这些环状结构都被认为是受到ngc1512自身引力不对称性的影响，这一漫长的过程被称为长期演化。这张特色图片是上个月从智利深空天文台的望远镜拍摄的。
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Most galaxies don't have any rings -- why does this galaxy have three? To begin, a ring that's near NGC 1512's center -- and so hard to see here -- is the nuclear ring which glows brightly with recently formed stars. Next out is a ring of stars and dust appearing both red and blue, called, counter-intuitively, the inner ring. This inner ring connects ends of a diffuse central bar of stars that runs horizontally across the galaxy. Farthest out in this wide field image is a ragged structure that might be considered an outer ring. This outer ring appears spiral-like and is dotted with clusters of bright blue stars. All these ring structures are thought to be affected by NGC 1512's own gravitational asymmetries in a drawn-out process called secular evolution. The featured image was captured last month from a telescope at Deep Sky Chile in Chile.
© Daniel Stern