对HB 3射电频谱的评论
Comments on the radio spectrum of HB 3
摘要：
最近有人提出，银河系超新星遗迹HB 3的射电频谱在更高的频率（约1 GHz以上）显示出平坦化。在这里，我回顾了HB 3的无线电频谱，注意到在推导这个残骸的准确通量密度方面的困难，特别是在高频率下，由于W3及其周围的明亮的热辐射的接近。HB 3在2695 MHz处的通量密度是由Effelsberg测量数据导出的。HB 3的频谱由22至2695 MHz的简单幂律频谱很好地表示，频谱指数为0.56 +/- 0.03。它的结论是，污染与相邻区域的热发射是HB 3的光谱平坦化的原因。
英文摘要：
It has recently been suggested that the radio spectrum of the Galactic supernova remnant HB 3 shows flattening at higher frequencies (above about 1 GHz). Here I review the radio spectrum of HB 3, noting the difficulties in deriving accurate flux densities for this remnant, particularly at high frequencies, due to the proximity of bright, thermal emission from W3 and its surroundings. A flux density for HB 3 at 2695 MHz is derived from Effelsberg survey data. The spectrum of HB 3 is well represented by a simple power-law spectrum from 22 to 2695 MHz, with a spectral index of 0.56 +/- 0.03. It is concluded that contamination with thermal emission from adjacent regions is the cause for the reported spectral flattening of HB 3.
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