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Aims. We have investigated neutral gas in the central cavity of thecircumnuclear disk (CND) at the Galactic Center, where the ionized minispirallies, to describe the H2 distribution and properties in this ionizedenvironment. Methods. This study was carried out through a spectro-imaging datacube of the central cavity obtained with SPIFFI on the VLT. The observed fieldof view is 36"x 29" , with a spectral resolution R = 1 300 in thenear-infrared. These observations cover several H2 lines. To preserve thespatial resolution and avoid edge effects, we applied a new line-fitting methodthat consists of a regularized 3D fitting. We also applied a more classical 1Dfitting to compare the relative strength of the H2 lines. Results. We presenthigh spatial and spectral resolution maps of the intensity, velocity, and widthof five H2 lines and an extinction map derived from H2. Molecular gas isdetected everywhere in the field. In particular, in addition to the known CNDfeatures, we detected an emission from the northern arm cloud and from theminicavity. The excitation diagrams allow us to estimate the temperature, mass,and density of these features. Conclusions. We interpret the CND emission ascoming from a hot, thermalized, thin layer at the surface of the clouds. Theobserved H2 corresponds only to a small fraction of the total H2 mass. Theemission remains fairly strong in the whole central cavity, but it is notthermalized. A strong deviation from thermal equilibrium is detected near theminicavity. We suggest that this emission is caused by constantly forming H2that is destroyed again before it reaches ortho/para equilibrium.

Hot molecular hydrogen in the central parsec of the Galaxy through near-infrared 3D fitting