天鹅座圈朱雀X射线谱共振线散射的证据
Evidence for Resonance Line Scattering in the Suzaku X-ray Spectrum of the Cygnus Loop
摘要：
我们提出了一个分析朱雀观测的东北边缘的天鹅座圈超新星遗迹。朱雀X射线CCD相机的高探测效率和高光谱分辨率使我们能够探测到天鹅座环的高电离C和N发射线。鉴于朱雀视场内的重要等离子体结构，我们根据ROSAT观测选择了最软的区域。朱雀光谱数据的特点是由一个两个组件的非平衡电离模型与不同的最佳拟合值的电子温度和电离时标。除O外，C ~ Fe丰度均为太阳丰度的0.23倍。与其他重元素相比，O的丰度相对减少了2倍。我们发现，共振线散射光学深度的强烈共振线的O是显着的，而其他共振线的光学深度是不显着的，它仍然需要考虑到准确的丰度测定。
英文摘要：
We present an analysis of the Suzaku observation of the northeastern rim of the Cygnus Loop supernova remnant. The high detection efficiency together with the high spectral resolution of the Suzaku X-ray CCD camera enables us to detect highly-ionized C and N emission lines from the Cygnus Loop. Given the significant plasma structure within the Suzaku field of view, we selected the softest region based on ROSAT observations. The Suzaku spectral data are well characterized by a two-component non-equilibrium ionization model with different best-fit values for both the electron temperature and ionization timescale. Abundances of C to Fe are all depleted to typically 0.23 times solar with the exception of O. The abundance of O is relatively depleted by an additional factor of two compared with other heavy elements. We found that the resonance-line-scattering optical depth for the intense resonance lines of O is significant and, whereas the optical depth for other resonance lines is not as significant, it still needs to be taken into account for accurate abundance determination.
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