Knots in the deep [FeII]+[SiI] image of the SNR Cas A

We present a long-exposure (~10hr), narrowband image of the supernova (SN) remnant Cassiopeia A (Cas A) centered at 1.644{mu}m emission. The passband contains [FeII] 1.644{mu}m...本研究展示了一幅长曝光（约10小时）的窄带图像，其观测对象为超新星（Supernova，SN）遗迹仙后座A（Cassiopeia A，Cas A），该图像以1.644微米辐射为中心波段。该通带包含[FeII] 1.644微米发射谱线……