Regularized 3D spectroscopy with CubeFit: Method and application to the Galactic Center circumnuclear disk,

Context. The Galactic Center black hole and the nuclear star cluster are surrounded by a clumpy ring of gas dust, circumnuclear disk (CND), that rotates about them at standoff distance ≃1.5 pc. mass density individual clumps in CND disputed. Aims. We seek to use H 2 characterize clump size distribution investigate morphology dynamics interface between ionized interior layer molecular reservoir lying farther out (corresponding inner rim CND, illuminated ultraviolet light central cluster). Methods. have observed two fields approximately 20″ × near-infrared wavelengths with OSIRIS spectro-imager Keck Observatory. These fields, located approaching receding nodes best display this interface. Our data cover lines as well Br γ line (tracing II). developed tool CubeFit, an original method for extracting maps continuous physical parameters (such velocity field dispersion) from integral-field spectroscopy data, using regularization largely preserve spatial resolution regions low signal-to-noise ratio. Results. This enables us isolate compact, bright features interstellar medium CND. Several southwestern assume appearance filaments, many which parallel one another. conclude these cannot be self-gravitating.