Abstract
We obtained the first view in H13CO+ J = 1-0 and a high-resolution map in thermal SiO lines of G0.11-0.11, which is a molecular cloud situated between the Galactic Center radio arc and Sgr A. From a comparison with previous line observations, we found that the H13CO+ J = 1-0 line is optically thin, whereas the thermal SiO lines are optically thick. The line intensity in H13CO+ J = 1-0 shows that the cloud has a large column density, up to N(H2) = (6-7) × 1023 cm-2, which corresponds to about 640-740 mag in AV or 10-12 mag in A25 μm. The estimated column density is the largest known of any even in the Galactic center region. We conclude from the intensity ratio of SiO J = 1-0 to CS J = 1-0 that emitting gas is highly inhomogeneous for SiO abundance on a scale smaller than the beam width ~35''.
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