伽马射线暴周围的x射线环
(原标题: X-Ray Rings Around a Gamma Ray Burst)
2022-10-17
浏览次数: 21
为什么x射线环会出现在伽马射线暴周围？这个令人惊讶的答案与爆炸本身没有什么关系，而是与我们银河系中充满尘埃的气体区域反射的光有关。GRB 221009A是一次巨大的爆炸——一次非常明亮的伽马射线爆发（GRB），它发生在宇宙的遥远地方，上周刚刚到达我们的太阳系。由于伽马射线暴也能发射出大量的x射线，所以一束明亮的x射线几乎与伽马射线同时到达。在这种情况下，x射线也从我们银河系的高尘埃区域反弹，产生了不寻常的反射。反射银河系尘埃和GRB之间的角度越大，x射线环的半径就越大，通常，这些光回波到达的时间就越长。
查看原文解释
Why would x-ray rings appear around a gamma-ray burst? The surprising answer has little to do with the explosion itself but rather with light reflected off areas of dust-laden gas in our own Milky Way Galaxy. GRB 221009A was a tremendous explosion -- a very bright gamma-ray burst (GRB) that occurred far across the universe with radiation just arriving in our Solar System last week. Since GRBs can also emit copious amounts of x-rays, a bright flash of x-rays arrived nearly simultaneously with the gamma-radiation. In this case, the X-rays also bounced off regions high in dust right here in our Milky Way Galaxy, creating the unusual reflections. The greater the angle between reflecting Milky Way dust and the GRB, the greater the radius of the X-ray rings, and, typically, the longer it takes for these light-echoes to arrive.