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.

中文翻译：

---

银河中心瓣的西部究竟在哪里？

银河中心瓣（GCL）是一个从银河平面向银河正纬度广泛突出的特殊物体，它是在早期射电观测中发现的朝向银河中心（GC）的物体。这种奇特的形状暗示了与GC中的历史事件、星爆、大爆炸等有任何关系。然而，GCL 是否是位于 GC 区域的单个大结构的问题尚未得到最终解决。在之前的观察中，在 GCL 的西部（WPGCL）发现了与低频发射相反的轮廓，这表明该部分位于 GC 区域的前面。另一方面，发现无线电复合线的 LSR 速度低至 0 kms$^{-1}$。然而，这些观察结果无法确定视线上的确切位置。还有一种可能是它位于 GC 区域的近侧区域。在此分析中，我们将这些结果与 GC 的视觉消光图进行了比较。我们发现视觉消光的分布大于 4 mag。清楚地对应于 WPGCL 的轮廓。WPGCL 必须最多位于离我们几个 kpc 的范围内，而不是在 GC 区域内。这将是银盘中一个巨大的 HII 区域。WPGCL 必须最多位于离我们几个 kpc 的范围内，而不是在 GC 区域内。这将是银盘中一个巨大的 HII 区域。WPGCL 必须最多位于离我们几个 kpc 的范围内，而不是在 GC 区域内。这将是银盘中一个巨大的 HII 区域。