朝向仙女座星系的意想不到的云
(原标题: Unexpected Clouds Toward the Andromeda Galaxy)
2023-01-17
浏览次数: 15
为什么在仙女座星系的方向附近会有氧气释放弧？没人能确定。蓝色显示的气体弧线是去年由业余天文学家发现并首次证实的。关于这些弧线的起源有两种主要的假设，一种是它们真的很靠近仙女座（M31），另一种是它们只是巧合地放置在我们银河系中的气体细丝。更神秘的是，在之前M31的深层图像中，主要是在氢发射的光线下拍摄的，没有看到弧，而其他更遥远的星系通常也没有发现类似的氧发射结构。专业的业余爱好者使用商业望远镜发现了这一发现，部分原因是，专业望远镜通常会研究夜空中角度较小的斑块，而这些弧线的跨度是满月的几倍。未来的观测——无论是对氧气发出的光还是对其他元素发出的光——肯定会随之而来。
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Why are there oxygen-emitting arcs near the direction of the Andromeda galaxy? No one is sure. The gas arcs, shown in blue, were discovered and first confirmed by amateur astronomers just last year. The two main origin hypotheses for the arcs are that they really are close to Andromeda (M31), or that they are just coincidentally placed gas filaments in our Milky Way galaxy. Adding to the mystery is that arcs were not seen in previous deep images of M31 taken primarily in light emitted by hydrogen, and that other, more distant galaxies have not been generally noted as showing similar oxygen-emitting structures. Dedicated amateurs using commercial telescopes made this discovery because, in part, professional telescopes usually investigate angularly small patches of the night sky, whereas these arcs span several times the angular size of the full moon. Future observations -- both in light emitted by oxygen and by other elements -- are sure to follow.
© Yann Sainty & Marcel Drechsler