朱雀天文台观测到的天鹅座圈东北缘异常不均匀性
Abundance Inhomogeneity in the Northeastern Rim of the Cygnus Loop Revealed by Suzaku Observatory
摘要：
我们提出了一个空间分辨光谱分析的结果，从四个朱雀观测覆盖东北边缘的天鹅座圈。一个2kT_e的非电离平衡（NEI）模型较好地代表了我们的数据，证实了该等离子体的NEI条件。在我们的视野中，几乎所有地方的金属丰度相对于太阳值都是耗尽的。我们发现整个领域的丰度不均匀性：最北端的区域（A区）与其他地区相比，绝对丰度有所提高。此外，Mg/O和Fe/O的相对丰度在A区低于太阳值，而在其他区域则是太阳值的2倍。就我们而言，无论是星周介质、喷出物碎片，还是天鹅座圈周围局部星际介质的丰度不均匀性，都不能解释A区相对增强的丰度。这一点留待今后工作解决。
英文摘要：
We present the results of a spatially resolved spectral analysis from four Suzaku observations covering the northeastern rim of the Cygnus Loop. A two-kT_e non-ionization equilibrium (NEI) model fairly well represents our data, which confirms the NEI condition of the plasma there. The metal abundances are depleted relative to the solar values almost everywhere in our field of view. We find abundance inhomogeneities across the field: the northernmost region (Region A) has enhanced absolute abundances compared with other regions. In addition, the relative abundances of Mg/O and Fe/O in Region A are lower than the solar values, while those in the other regions are twice higher than the solar values. As far as we are concerned, neither a circumstellar medium, fragments of ejecta, nor abundance inhomogeneities of the local interstellar medium around the Cygnus Loop can explain the relatively enhanced abundance in Region A. This point is left as an open question for future work.
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。
