Title: Molecular gas in the center of the Galaxy

Abstract:
In the central parsec of the Galaxy the environment of the black hole Sgr A* presents, besides 
the star cluster, two different gas structures: a molecular cloud ring - the Circumnuclear Disc  
(CND) - and a spiral of ionized gas - the Minispiral. In order to fully understand the origin and 
dynamics of these structures, in particular the neutral/ionized transition, and their relation with 
Srg A*,  I investigate in my PhD the presence of neutral gas in the inner part of the CND, where 
the ionized Minispiral lies. Such study is carried out through near-infrared spectro-imaging data 
of the central cavity observed with SPIFFI at the VLT. In order to preserve the spatial resolution, 
a new data reduction and analysis method is applied: regularized three-dimensional fit of the 
spectral features, developed by T. Paumard. Through these data and this method we produced 
the highest resolution map of the 1-0 S(1) line emission, together with its velocity and width 
maps. Three different components of this emission have been identified: from the CND, from the 
background and from the northern Arm of the Minispiral.