铅笔星云与超新星冲击波

2021年04月14日

The Pencil Nebula Supernova Shock Wave
Image Credit & Copyright: Greg Turgeon & Utkarsh Mishra

Explanation: This supernova shock wave plows through interstellar space at over 500,000 kilometers per hour. Near the middle and moving up in this sharply detailed color composite, thin, bright, braided filaments are actually long ripples in a cosmic sheet of glowing gas seen almost edge-on. Cataloged as NGC 2736, its elongated appearance suggests its popular name, the Pencil Nebula. The Pencil Nebula is about 5 light-years long and 800 light-years away, but represents only a small part of the Vela supernova remnant. The Vela remnant itself is around 100 light-years in diameter, the expanding debris cloud of a star that was seen to explode about 11,000 years ago. Initially, the shock wave was moving at millions of kilometers per hour but has slowed considerably, sweeping up surrounding interstellar material. In the featured narrow-band, wide field image, red and blue colors track, primarily, the characteristic glows of ionized hydrogen and oxygen atoms, respectively.

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铅笔星云与超新星冲击波
影像提供与版权: Greg Turgeon & Utkarsh Mishra

说明: 这道超新星冲击波，以每小时超过500,000公里的速度犁过星际空间。在这幅美丽细致的彩色组合影像的中心附近，向上移动的纤细明亮辫状波纹，其实是几乎侧向的层状宇宙辉光云气上的涟漪。这团编录号为NGC 2736的星云，因为拥有细长的外貌而获得铅笔星云的雅号。离我们约800光年远的铅笔星云，长约5光年左右，是船帆座超新星遗迹的一小部份。船帆座超新星遗迹本身的直径则在100光年左右，是人类在11,000年前见到的恒星爆炸，所留下的扩张恒星碎片云。最起初，冲击波的速度高达每小时数百万公里，但随着它扫集周遭的星际云气，速度已大幅降低。在这幅窄波段广角影像里，红及蓝色泽分别标示来自电离氢原子和氧原子的特征辐射。

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