Thermal SiO and H13CO+ line observations of the dense molecular cloud G0.11-0.11 in the Galactic Center region
Thermal SiO and H13CO+ line observations of the dense molecular cloud G0.11-0.11 in the Galactic Center region
复制标题
DOI：
10.1086/497881
复制
发表时间：
2006-01-01
影响因子：
4.9
通讯作者：
Hiramatsu, M
中科院分区：
文献类型：
--
作者：
Handa, T;Sakano, M;Hiramatsu, M
我们获得了(HCO+)-C-13 J = 1-0的第一个视图和G0.11-0.11热SiO谱线的高分辨率图，G0.11-0.11是位于银心射电弧和Sgr A之间的分子云。通过与之前的线观测比较，我们发现(HCO+)-C-13 J = 1-0谱线光学上很薄，而热SiO谱线光学上很厚。 (HCO+)-C-13 J = 1-0 中的线强度表明云具有很大的柱密度，高达 N( H-2) = ( 6-7) x 10(23) cm(-2) ，相当于 A(V) 中的约 640 - 740 mag 或 A(25 mu m) 中的 10 - 12 mag。估计的柱密度是已知最大的，甚至在银河系中心区域也是如此。我们从 SiO J = 1-0 与 CS J = 1-0 的强度比得出结论，在小于类似于 35" 的光束宽度的尺度上，发射气体对于 SiO 丰度是高度不均匀的。
We obtained the first view in (HCO+)-C-13 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 (HCO+)-C-13 J = 1-0 line is optically thin, whereas the thermal SiO lines are optically thick. The line intensity in (HCO+)-C-13 J = 1-0 shows that the cloud has a large column density, up to N( H-2) = ( 6-7) x 10(23) cm(-2), which corresponds to about 640 - 740 mag in A(V) or 10 - 12 mag in A(25 mu m). 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 similar to 35".