We present 3D-Barolo, a new code that derives rotation curves of galaxiesfrom emission-line observations. This software fits 3D tilted-ring models tospectroscopic data-cubes and can be used with a variety of observations: fromHI and molecular lines to optical/IR recombination lines. We describe thestructure of the main algorithm and show that it performs much better than thestandard 2D approach on velocity fields. A number of successful applications,from high to very low spatial resolution data are presented and discussed.3D-Barolo can recover the true rotation curve and estimate the intrinsicvelocity dispersion even in barely resolved galaxies (about 2 resolutionelements) provided that the signal to noise of the data is larger that 2-3. Itcan also be run automatically thanks to its source-detection and first-estimatemodules, which make it suitable for the analysis of large 3D datasets. Thesefeatures make 3D-Barolo a uniquely useful tool to derive reliable kinematicsfor both local and high-redshift galaxies from a variety of differentinstruments including the new-generation IFUs, ALMA and the SKA pathfinders.
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