银心区中性原子K壳层发射线的发现
Discovery of K-Shell Emission Lines of Neutral Atoms in the Galactic Center Region
摘要：
银河系中心中性离子K壳层发射线是研究银河系中心结构和活动的关键之一。其起源仍然是一个悬而未决的问题，但可能是由于X射线辐射或电子轰击中性原子。为了解决这个问题，我们分析了朱雀X射线光谱的GC区域的强烈中性铁线发射，并报告发现中性氩，钙，铬，锰原子的K α线。这些K α线的等效宽度表明，GC区域的金属丰度应该是太阳值的~1.6和~4，分别取决于X射线和电子的起源。另一方面，在GC区的热等离子体中的金属丰度被发现是~1-2太阳。这些结果支持中性K α线的起源是由于X射线照射。
英文摘要：
The K-shell emission line of neutral irons from the Galactic center (GC) region is one of the key for the structure and activity of the GC. The origin is still open question, but possibly due either to X-ray radiation or to electron bombarding to neutral atoms. To address this issue, we analyzed the Suzaku X-ray spectrum from the GC region of intense neutral iron line emission, and report on the discovery of Kalpha lines of neutral argon, calcium, chrome, and manganese atoms. The equivalent widths of these Kalpha lines indicate that the metal abundances in the GC region should be ~1.6 and ~4 of solar value, depending on the X-ray and the electron origins, respectively. On the other hand, the metal abundances in the hot plasma in the GC region are found to be ~1-2 solar. These results favor that the origin of the neutral Kalpha lines are due to X-ray irradiation.
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