Where is the Western Part of the Galactic Center Lobe Located really?. (arXiv:2007.09673v1 [astro-ph.GA])

Where is the Western Part of the Galactic Center Lobe Located really?. (arXiv:2007.09673v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Tsuboi_M/0/1/0/all/0/1">Masato Tsuboi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tsutsumi_T/0/1/0/all/0/1">Takahiro Tsutsumi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kitamura_Y/0/1/0/all/0/1">Yoshimi Kitamura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Miyawaki_R/0/1/0/all/0/1">Ryosuke Miyawaki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Miyazaki_A/0/1/0/all/0/1">Atsushi Miyazaki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Miyoshi_M/0/1/0/all/0/1">Makoto Miyoshi</a>

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.

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.

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