. . "aah1205" . "Atomic and molecular gas in the starburst galaxy NGC 4945"@en . . . "2001"^^ . . . . . . . "\u00A9 ESO, 2001" . "2001"^^ . . "Spatial and kinematical correlations between the H i and 12CO(2-1) emission of the southern spiral galaxy NGC 4945 are studied with a common angular resolution of ~23 '' (corresponding to 750 pc at $D=6.7$ Mpc) and a velocity resolution of ~7 ${\\rm km s}^{-1}$. The 1.4 GHz continuum emission is also observed. The H i kinematics yield a galaxy mass of ~ $1.4\\times10^{11}$$M_{odot}$ within radius $R=380''$, with molecular and neutral atomic gas each contributing ~2% , respectively. A central continuum source of size 7 $ .\\!\\!^{\\prime\\prime}$6 $\\times$ 3 $ .\\!\\!^{\\prime\\prime}$4 (250 $\\times$ 110 pc) is enveloped by a molecular cloud of mass $1.5\\times10^9$$M_{odot}$ for R\u2264 7 $ .\\!\\!^{\\prime\\prime}$5, and is rapidly rotating with $V_{\\rm rot} \\sim 160$${\\rm km s}^{-1}$. H i emission from the central region at velocities $|V-$Vsys$|$> 200 ${\\rm km s}^{-1}$ may be related to optically detected gas that is believed to trace an outflow directed towards the halo. Nuclear H i absorption at V - Vsys ~ +80 ${\\rm km s}^{-1}$ suggests inflow towards the centre, that was so far only seen in molecular lines. H i features at each end of the major axis ( $|R|$ ~ 600 '') are interpreted as spiral arms that are viewed tangentially and that also cause prominent emission features in the radio continuum, H i, and CO further inside the galaxy. A central elongated region showing non-circular motions is interpreted as a bar which fuels the nuclear starburst. The H i and CO position-velocity data have been analysed using linear resonance theory, and possible locations of resonances are identified."@en . . . . . . "ESO" . . . . . . .