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We consider the radiation-hydrodynamical formation of a dusty wall in thecircumnuclear regions of the Circinus Seyfert 2 galaxy. We focus on theradiative flux force due to the circumnuclear starburst, the nuclear starburstand the active galactic nucleus (AGN), and analyze the equilibriumconfiguration and stability of the dusty gas in the circumnuclear regions. Themass distributions used to model the gravitational fields are determined by theobserved rotation velocities of the stars and of the gas. Moreover, by usingthe simple stellar evolution in the circumnuclear starburst, the bolometricluminosity of the starburst is estimated as a function of time. As a result, itis shown that the radiation force by the circumnuclear starburst does play animportant role to build up a radiatively-supported dusty wall of $\la$ 100 pc,which obscures the circumnuclear regions with $A_V$ of a few magnitudes. It isalso found that the age of a circumnuclear starburst when the circumnuclearregions are enshrouded by the dusty wall is constrained to be $\la 10^8$ yr,which is consistent with the age observationally inferred for the starburst, $410^7$ yr $-1.5 10^8$ yr.Comment: 6 pages, 4 figures, accepted for publication in A&

Circumnuclear obscuration of the Circinus galaxy by a starburst-radiation supported wall