Papers › HCN J=4-3, HNC J=1-0, H¹³CN J=1-0, and HC₃N J=10-9 Maps of Galactic Center Region I:...
HCN J=4-3, HNC J=1-0, H¹³CN J=1-0, and HC₃N J=10-9 Maps of Galactic Center Region I: Spatially-Resolved Measurements of Physical Conditions and Chemical Composition
Kunihiko Tanaka, Makoto Nagai, Kazuhisa Kamegai, Takahiro Iino., Takeshi Sakai
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This {\it supplement} paper presents the maps of HCN J=4-3, HNC J=1-0, H¹³CN J=1-0, and HC₃N J=10-9 for the Galactic central molecular zone (CMZ), which have been obtained using the Atacama Submillimeter Telescope Experiment and Nobeyama Radio Observatory 45-m telescope. Three-dimensional maps (2-D in space and 1-D in velocity) of the gas kinetic temperature (Tₖᵢₙ), hydrogen volume density (n_(H₂)), and fractional abundances of eight molecules (HCN, HNC, HC₃N, HCO^+, H₂CO, SiO, CS, and N₂H^+) have been constructed from our and archival data. We have developed a method with hierarchical Bayesian inference for this analysis, which has successfully suppressed the artificial correlations among the parameters created by systematic errors due to the deficiency in the simple one-zone excitation analysis and the calibration uncertainty. The typical values of Tₖᵢₙ and n_(H₂) are $10^{1.8}\ $K and 10^(4.2) cm⁻³, respectively, and the presence of an additional cold/low-density component is also indicated. The distribution of high-temperature regions is poorly correlated with known active star-forming regions, while a few of them coincide with shocked clouds. Principal component analysis has identified two distinct groups in the eight analyzed molecules: one group with large PC1 and PC2 scores and the other with a large Tₖᵢₙ dependence, which could be explained using two regimes of shock chemistry with fast (≳20 km s⁻¹) and slow (≲20 km s⁻¹) velocity shocks, respectively. This supports the idea that the mechanical sputtering of dust grains and the mechanical heating play primary roles in the chemical and thermal processes in CMZ clouds.
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