天鹅座圈东南翼的另一个异常不均匀体
Another Abundance Inhomogeneity in the South East Limb of the Cygnus Loop
摘要：
我们用{ \it朱雀}观测了天鹅座圈的东南侧。我们的空间分辨光谱研究表明，一个一个$kT_\mathrm{e}$非平衡电离模型代表我们的光谱相当不错。我们发现，获得的金属丰度都是相对于太阳值的位置依赖性沿天鹅座圈的径向方向耗尽。边缘的丰度约为太阳值的一半，而圈内的其他区域约为太阳值的0.2倍，这被认为是天鹅座圈边缘的典型值。东南边缘的“增强”丰度与在环东北边缘发现的丰度非常相似，因此这是环边缘区域丰度不均匀的另一个证据。射电图显示了一个完全不同的功能：东北边位于射电亮区，而东南边几乎没有射电。因此，东南翼的金属丰度变化不能归因于非热辐射。丰度的不均匀性以及金属的消耗下降到太阳值的0.2倍仍然是一个悬而未决的问题。
英文摘要：
We have observed the south-east (SE) limb of the Cygnus Loop with {\it Suzaku}. Our spatially-resolved spectroscopic study shows that a one-$kT_\mathrm{e}$ non-equilibrium ionization model represents our spectra fairly well. We find that the metal abundances obtained are all depleted relative to the solar values with a positional dependency along the radial direction of the Cygnus Loop. The abundances in the very edge of the limb shows about half the solar value, whereas other regions inside the Loop show about 0.2 times the solar value which has been believed as a typical value for the Cygnus Loop limb. The "enhanced" abundance in the very edge in the SE limb is quite similar to that found in the north-east (NE) limb of the Loop, and thus this is another evidence of abundance inhomogeneity in the limb regions of the Loop. The radio map shows a quite different feature: the NE limb is in the radio bright region while the SE limb shows almost no radio. Therefore, the metal abundance variation in the SE limb can not attribute to the non-thermal emission. The abundance inhomogeneity as well as the metal depletion down to 0.2 times the solar value still remain an open question.
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