超新星遗迹CTA 1
(原标题: Supernova Remnant CTA 1)
2024-08-23
浏览次数: 11
在cta1的中心有一颗安静的脉冲星。1960年，天文学家发现这颗超新星的残骸是射电波长的辐射源，后来被确定为一颗大质量恒星死亡爆炸的结果。但是没有从预期的脉冲星中检测到无线电脉冲，脉冲星是大质量恒星坍缩核心的旋转中子星残骸。在最初的超新星爆炸后大约一万年，星际碎片云在光学波长上是微弱的。这张深望远镜拍摄的图像显示了CTA 1的可见波长辐射，它来自仍在膨胀的激波锋面，这幅图像在仙王座北部的一个星场上跨度约2度。虽然此后没有发现射电波长的脉冲星，但2008年费米伽玛射线太空望远镜探测到CTA 1的脉冲发射，确定了超新星遗迹的旋转中子星。这颗脉冲星被认为是越来越多的脉冲星中的第一颗，这些脉冲星在射电波长下是安静的，但在高能伽马射线中脉冲。
查看原文解释
There is a quiet pulsar at the heart of CTA 1. The supernova remnant was discovered as a source of emission at radio wavelengths by astronomers in 1960 and since identified as the result of the death explosion of a massive star. But no radio pulses were detected from the expected pulsar, the rotating neutron star remnant of the massive star's collapsed core. Seen about 10,000 years after the initial supernova explosion, the interstellar debris cloud is faint at optical wavelengths. CTA 1's visible wavelength emission from still expanding shock fronts is revealed in this deep telescopic image, a frame that spans about 2 degrees across a starfield in the northern constellation of Cepheus. While no pulsar has since been found at radio wavelengths, in 2008 the Fermi Gamma-ray Space Telescope detected pulsed emission from CTA 1, identifying the supernova remnant's rotating neutron star. The source has been recognized as the first in a growing class of pulsars that are quiet at radio wavelengths but pulse in high-energy gamma-rays.
© Thomas Lelu