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arXiv 0910.3302astro-ph.HE
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朱雀号发现超新星遗迹W49B中铁的强辐射衰变连续谱

Suzaku Discovery of the Strong Radiative Recombination Continuum of Iron from the Supernova Remnant W49B

Midori Ozawa, Katsuji Koyama, Hiroya Yamaguchi, Kuniaki Masai, Toru Tamagawa

摘要:

我们提出了一个硬X射线光谱的质量前所未有的银河系超新星遗迹W 49 B与朱雀卫星获得。该光谱表现出一种不寻常的结构,包括一个锯齿状隆起超过8千电子伏。这种隆起不能用电离平衡中的高温等离子体的任何组合来解释。我们坚定地得出结论,这种碰撞是由铁的强辐射复合连续谱(RRC)引起的,这是第一次在超新星遗迹中检测到。从韧致辐射连续体形状和RRC的斜率导出的电子温度为1.5 keV。另一方面,从观测到的铁的RRC和K-α线之间的强度比导出的电离温度为2.7 keV。这些结果表明等离子体处于高度过电离状态。独立确定的热量和RRC组件的通量的体积排放量的措施是相互一致的,这表明这些组件的相同的起源。

英文摘要:

We present a hard X-ray spectrum of unprecedented quality of the Galactic supernova remnant W49B obtained with the Suzaku satellite. The spectrum exhibits an unusual structure consisting of a saw-edged bump above 8 keV. This bump cannot be explained by any combination of high-temperature plasmas in ionization equilibrium. We firmly conclude that this bump is caused by the strong radiative recombination continuum (RRC) of iron, detected for the first time in a supernova remnant. The electron temperature derived from the bremsstrahlung continuum shape and the slope of the RRC is 1.5 keV. On the other hand, the ionization temperature derived from the observed intensity ratios between the RRC and K-alpha lines of iron is 2.7 keV. These results indicate that the plasma is in a highly overionized state. Volume emission measures independently determined from the fluxes of the thermal and RRC components are consistent with each other, suggesting the same origin of these components.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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