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Paper: Spatially-resolved Measurement of Hydrogen Volume Density in the Central Molecular Zone of the Milky Way
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 329
Authors: Tanaka, K.
Abstract: We present the results of spatially resolved measurement of hydrogen volume density in the CMZ obtained through excitation study using 13 archival and newly-obtained molecular line data, whee a newly-developed hierarchical parameter inference technique is used to suppress artifacts from the deficiency in simple one-zone LVG analysis. The main results are: (1) CMZ clouds are generally affected by shock-waves, as indicated by the spatial correlation between the temperature variation and that in the abundances of shock-tracer molecules. (2) Statistical discriminant analysis has shown that the parameters that distinguish the clouds with signatures of star formation from quiescent clouds are the virial parameter and volume density.
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