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Being one of the most abundant atomic/molecular species observed in densemolecular gas, atomic carbon ($\mathrm{C}^0$) is a potential good tracer ofmolecular gas mass in many chemical/physical environments, though the$\mathrm{C^0}$ abundance variation outside the Galactic disk region is yet tobe fully known. This paper presents a wide-field 500 GHz [CI] map of theGalactic central molecular zone (CMZ) obtained with the ASTE 10-m telescope.Principal component analysis and non-LTE multi-transition analysis have shownthat the [CI] emission predominantly originates from the low-excitation gascomponent with a 20-50 K temperature and $\sim 10^3\ \mathrm{cm}^{-3}$ density,whereas $\mathrm{C^0}$ abundance is likely suppressed in the high-excitationgas component. The average $N(\mathrm{C}^0)$/$N(\mathrm{CO})$ abundance ratioin the CMZ is 0.3-0.4, which is 2-3 times that in the Galactic disk. The$N(\mathrm{C}^0)$/$N(\mathrm{CO})$ ratio increases to 0.7 in the innermost 10pc region and to $\sim2$ in the circumnuclear disk. We discovered$\mathrm{C^0}$-rich regions distributed in a ring-shape encircling thesupernova remnant (SNR) Sgr A east, indicative that the$\mathrm{C}^0$-enrichment in the central 10 pc region is a consequence of amolecular cloud-SNR interaction. In the 15 atom/molecules included in principalcomponent analysis (PCA), CN is the only other species that increases in the[CI]-bright ring. The origin of the [CI]-bright ring is likely a cosmic-raydominated region created by low-energy cosmic-ray particles accelerated by SgrA east or primitive molecular gas collected by the SNR in which the$\mathrm{C}^0$-to-CO conversion has not reached the equilibrium.

astrophysical journal/the astrophysical journal

Atomic Carbon in the Central Molecular Zone of the Milky Way : Possible  Cosmic-ray Induced Chemistry or Time-Dependent Chemistry Associated with SNR  Sagittarius A East