银河系SNR 3C 58前SN质量损失的证据
Evidence for Pre-SN Mass Loss in the Galactic SNR 3C 58
摘要：
我们讨论了与超新星遗迹3C 58（Fesen et al. 2007）相关的光学发射的综合成像和光谱调查的结果，因为它们与前SN质量损失的主题有关。光谱测量的约450个发射结的径向速度显示了两种不同的光学结运动学种群：一个径向速度在700 - 1100 km/s范围内的高速组和一个径向膨胀速度低于约250 km/s的低速组。我们解释的高速节从SN爆炸喷出物和低速节作为冲击拱星材料可能导致前SN质量损失。两个种群的化学特征也显示出明显的差异。高速组包括大量的结，明显更高的[N II]/H-α比没有看到在较低的速度人口，这表明更大的氮富集在SN喷出物比CSM。这些结果进行了比较，前SN质量损失的蟹状星云的证据，也许SNR最相似的3C 58。这些SNRs可能包括两个案例研究的前SN质量损失相对较低的质量（约8 - 10太阳质量）的核心坍缩SN祖。
英文摘要：
We discuss the findings of a comprehensive imaging and spectroscopic survey of the optical emission associated with the supernova remnant 3C 58 (Fesen et al. 2007) as they relate to the topic of pre-SN mass loss. Spectroscopically measured radial velocities of ~450 emission knots within the remnant show two distinct kinematic populations of optical knots: a high-velocity group with radial velocities in the range of 700 - 1100 km/s and a lower velocity group exhibiting radial expansion velocities below ~250 km/s. We interpret the high-velocity knots as ejecta from the SN explosion and the low-velocity knots as shocked circumstellar material likely resulting from pre-SN mass loss. The chemical signatures of the two populations also show marked differences. The high velocity group includes a substantial number of knots with notably higher [N II]/H-alpha ratios not seen in the lower velocity population, suggesting greater nitrogen enrichment in the SN ejecta than in the CSM. These results are compared with evidence for pre-SN mass loss in the Crab Nebula, perhaps the SNR most similar to 3C 58. These SNRs may comprise two case studies of pre-SN mass loss in relatively low mass (~8 - 10 solar masses) core-collapse SN progenitors.
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