ISM Processing in the Inner 20 pc in Galactic center
Hauyu Baobab Liu, Paul T.-P. Ho, Melvyn C. H. Wright, Yu-Nung Su,, Pei-Ying Hsieh, Ai-Lei Sun, Sungsoo S. Kim, Young Chol Minh

TL;DR
This study uses high-resolution submillimeter and radio observations to map dense gas structures in the Galactic center's inner 20 parsecs, revealing complex, dynamic, and possibly unbound gas clumps with active star formation indicators.
Contribution
It provides detailed imaging of the dense gas and dust in the Galactic center, demonstrating the non-stationary nature of the circumnuclear disk and its environment, and linking maser activity to feedback processes.
Findings
Dense gas clumps are unbound and dynamically active.
High-resolution dust maps confirm structures within the CND.
Masers are associated with feedback, not gravitational binding.
Abstract
We present the Submillimeter Array (SMA) 157-pointing mosaic in 0.86 mm dust continuum emission with 5.2 angular resolution, and the NRAO Green Bank 100m Telescope (GBT) observations of the CS/CS/CS 1-0 and SiO 1-0 emission with angular resolution. The dust continuum image marginally resolves at least several tens of 10-10 dense clumps in the 5 field including the circumnuclear disk (CND) and the exterior gas streamers. There is very good agreement between the high resolution dust continuum map of the CND and all previous molecular line observations. As the dust emission is the most reliable optically thin tracer of the mass, free from most chemical and excitation effects, we demonstrate the reality of the abundant localized structures within the CND, and their connection to external gas structures. From the spectral…
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