RCW 86：历史超新星遗迹
(原标题: RCW 86: Historical Supernova Remnant)
2022-05-28
浏览次数: 14
公元185年，中国天文学家记录了南门星群出现了一颗新星。在现代星图上，这部分天空被认为是半人马座α星和β星。这颗新恒星持续了几个月，被认为是有记录以来最早的超新星。这张深度图像显示了发射星云RCW 86，它被认为是那次恒星爆炸的遗迹。窄带数据记录了被仍在膨胀的激波电离的气体。天基图像显示，残骸中有丰富的铁元素，没有中子星或脉冲星，这表明最初的超新星是Ia型。与大质量恒星的核心坍缩超新星爆炸不同，Ia型超新星是一颗白矮星上的热核爆炸，它从双星系统的伴星中吸积物质。在我们银河系的平面附近，比天空中的满月还要大，这颗超新星的遗迹太暗了，无法用肉眼看到。rcw86距离地球约8000光年，直径约100光年。
查看原文解释
In 185 AD, Chinese astronomers recorded the appearance of a new star in the Nanmen asterism. That part of the sky is identified with Alpha and Beta Centauri on modern star charts. The new star was visible for months and is thought to be the earliest recorded supernova. This deep image shows emission nebula RCW 86, understood to be the remnant of that stellar explosion. The narrowband data trace gas ionized by the still expanding shock wave. Space-based images indicate an abundance of the element iron and lack of a neutron star or pulsar in the remnant, suggesting that the original supernova was Type Ia. Unlike the core collapse supernova explosion of a massive star, a Type Ia supernova is a thermonuclear detonation on a a white dwarf star that accretes material from a companion in a binary star system. Near the plane of our Milky Way galaxy and larger than a full moon on the sky this supernova remnant is too faint to be seen by eye though. RCW 86 is some 8,000 light-years distant and around 100 light-years across.
© Martin Pugh