will be inserted by hand later ) X-ray emission from radiative shocks in Type II supernovae
will be inserted by hand later ) X-ray emission from radiative shocks in Type II supernovae
复制标题
稍后将用手插入）II 型超新星中辐射冲击的 X 射线发射
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
C. Kozma
中科院分区：
文献类型：
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作者：
T. Nymark;C. Fransson;C. Kozma
计算了II型超新星与致密星周介质的星周相互作用的X射线辐射。在IIL型和IIn型超新星中，质量损失率通常很高，足以使反向激波后面的区域具有辐射性，产生强烈的辐射，特别是X射线。我们提出了一个模型的辐射反向冲击的情况下，从冷却区的排放。在定常流动的假设下，流体动力学模型与时间相关的电离平衡和多级计算相结合。稳态近似的适用性进行了讨论的喷出物密度梯度和不同的化学成分的各种值。我们展示了如何新兴的频谱强烈依赖于反向冲击波的速度和组成的冲击气体。我们讨论了由该模型产生的光谱和单温度光谱之间的差异。特别是线发射的差异很大，这可能会严重影响丰度估计。我们还说明了吸收的影响，在冷冲击喷出物。我们的模型对各种类型的超新星的适用性进行了讨论。
The X-ray emission from the circumstellar interaction in Type II supernovae with a dense circumstellar medium is calculated. In Type IIL and Type IIn supernovae mass loss rates are generally high enough for the region behind the reverse shock to be radiative, producing strong radiation, particularly in X-rays. We present a model for the emission from the cooling region in the case of a radiative reverse shock. Under the assumption of a stationary flow, a hydrodynamic model is combined with time dependent ionization balance and multilevel calculations. The applicability of the steady state approximation is discussed for various values of the ejecta density gradient and different sets of chemical composition. We show how the emerging spectrum depends strongly on the reverse shock velocity and the composition of the shocked gas. We discuss differences between a spectrum produced by this model and a single-temperature spectrum. Large differences for especially the line emission are found, which seriously can affect abundance estimates. We also illustrate the effects of absorption in the cool shocked ejecta. The applicability of our model for various types of supernovae is discussed.