Gas Kinematics from the Center to the Outer Disk
New high resolution sub-arcsecond observations of the molecular gas in the central 300 pc of the two late-type spiral galaxies NGC 6946 and IC 342 are presented. In both galaxies there is evidence for gas inflow in the central 100 pc. While the inflow in NGC 6946 is very likely due to a small-scale secondary bar, it appears that inflow in IC 342 is associated to a density wave driven by the large-scale bar. Despite these differences, the analysis of the gas kinematics in both galaxies strongly suggests that the central gas reservoir can be replenished, thus providing the fuel for repeated massive star formation. In order to study the gas kinematics from the very nucleus to the outskirts of the galactic disk itself, the HI-NUGA survey was established. The design and aim of this HI survey conducted at the VLA are described and preliminary results are presented.
KeywordsLine Emission Star Formation Spiral Galaxy Outer Disk Very Large Array
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