2025年4月9日
HH 49: Interstellar Jet from Webb
Image Credit: NASA, ESA, CSA, STScI, JWST
Explanation: What’s at the tip of this interstellar jet? First let’s consider the jet: it is being expelled by a star system just forming and is cataloged as Herbig-Haro 49 (HH 49). The star system expelling this jet is not visible — it is off to the lower right. The complex conical structure featured in this infrared image by the James Webb Space Telescope also includes another jet cataloged as HH 50. The fast jet particles impact the surrounding interstellar gas and form shock waves that glow prominently in infrared light — shown here as reddish-brown ridges. This JWST image also resolved the mystery of the unusual object at HH 49‘s tip: it is a spiral galaxy far in the distance. The blue center is therefore not one star but many, and the surrounding circular rings are actually spiral arms.
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韦伯影像: 星际喷流HH 49
影像提供: NASA, ESA, CSA, STScI, JWST
说明: 这道星际喷流的尖端有什么？首先，这道编录号为赫比格-哈罗49（HH 49）的喷流，其源头是形成中的恒星系统。不过，释放出这道喷流的恒星系统，并未见于影像里，而是位于视野的右下缘外头。这幅韦伯太空望远镜的红外线影像，所呈现复杂的圆锥状结构，其内有另一道名为HH 50的喷流。这道喷流里的高速粒子，冲撞周围的星际气体并产生激波，激发气体发出明亮的红外光，成就了影像中的红褐色脊状结构。而这张韦伯望远镜影像，更解开位于HH 49喷流尖端的神秘天体之真面目，它是一个远在后方的螺旋星系。因此，影像中蓝色区域的核心，并非单颗恒星，而是由繁多恒星聚成的星系核心，周围的圆环状结构，则是螺旋星系的螺旋臂。
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