天鹅座环北缘的异常不均匀性
The Abundance Inhomogeneity in the Northern Rim of the Cygnus Loop
摘要：
我们用\textit{Suzaku}天文台在5个点（P21-P25）观测了天鹅座圈的北缘。从空间分辨分析，所有的光谱很好地拟合的非平衡电离等离子体模型的单一组件。从最佳拟合参数中发现，除了P21和P22最外缘的重元素丰度值外，其余重元素丰度值均显著低于太阳值。贫化金属丰度的来源仍然不清楚，而这种缺陷已从许多其他环缘观测报告。为了解释边缘区域的这些损耗，我们考虑了几种可能性。共振线散射和颗粒凝聚的影响降低了丰度值。然而，这些都不足以解释所观察到的丰度减少。我们发现，在P21和P22的最外边缘的丰度高于其他区域。从形态学的角度来看，认为这种丰度不均匀性是由断裂或Loop的空腔壁的薄度引起的是合理的。
英文摘要：
We observed the northern rim of the Cygnus Loop with the \textit{Suzaku} observatory in 5 pointings (P21-P25). From the spatially resolved analysis, all the spectra are well fitted by the single component of the non-equilibrium ionization plasma model. From the best-fit parameters, we found that the abundances of the heavy elements are significantly lower than the solar values except those at the outermost edge in P21 and P22. The origin of the depleted metal abundances is still unclear while such deficiencies have been reported from many other rim observations of the Loop. To explain these depletion at the rim regions, we considered the several possibilities. The effects of the resonance-line-scattering and the grain condensation lower the values of the abundances. However, these are not sufficient to account for the abundance depletion observed. We found that the abundances at the outermost edge in P21 and P22 are higher than those at the other regions. From the morphological point of view, it is reasonable to consider that this abundance inhomogeneity is derived from the breakout or the thinness of the cavity wall of the Loop.
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