银河系中心叶的西部到底在哪里？
Where is the Western Part of the Galactic Center Lobe Located really?
摘要：
银心瓣（Galactic Center Lobe，GCL）是在射电观测早期发现的一个向银心（Galactic Center，GC）方向突出的奇特天体。这一奇特的形状暗示了它与GC中的历史事件、恒星爆发、大爆炸等有关。然而，GCL是否是位于GC区域的单个大型结构的问题尚未得到最终解决。在以前的观测中，在GCL的西部（WPGCL）发现了与低频发射相对的轮廓，这表明该部分位于GC区的前面。另一方面，发现射电复合线的LSR速度低至0 kms $^{-1}$。然而，这些观察无法确定视线上的确切位置。还有另一种可能性是在GC区域的近侧区域。在这个分析中，我们将这些结果与GC的视觉消光图进行了比较。我们发现，大于4倍的视消光的分布清楚地对应于WPGCL的轮廓。WPGCL必须位于离我们最多几千秒差距的地方，而不是在GC区域。这将是银河系圆盘中的一个巨大的HII区域。
英文摘要：
The Galactic Center Lobe (GCL) is a peculiar object widely protruding from the Galactic plane toward the positive Galactic latitude, which had been found toward the Galactic Center (GC) in the early days of the radio observation. The peculiar shape has suggested any relation with historical events, star burst, large explosion and so on in the GC. However, the issue whether the GCL is a single large structure located in the GC region is not yet settled conclusively. In the previous observations, the silhouette against the low frequency emission was found in the western part of the GCL (WPGCL), This suggests that the part is located in front of the GC region. On the other hand, the LSR velocity of the radio recombination line toward it was found to be as low as 0 kms$^{-1}$. However, these observations cannot determine the exact position on the line-of-sight. There is still another possibility that it is in the near side area of the GC region. In this analysis, we compare these results with the visual extinction map toward the GC. We found that the distribution of the visual extinction larger than 4 mag. clearly corresponds to the silhouette of the WPGCL. The WPGCL must be located at most within a few kpc from us and not in the GC region. This would be a giant HII region in the Galactic disk.
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。
