3D-Barolo: a new 3D algorithm to derive rotation curves of galaxies
  We present 3D-Barolo, a new code that derives rotation curves of galaxies
from emission-line observations. This software fits 3D tilted-ring models to
spectroscopic data-cubes and can be used with a variety of observations: from
HI and molecular lines to optical/IR recombination lines. We describe the
structure of the main algorithm and show that it performs much better than the
standard 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 intrinsic
velocity dispersion even in barely resolved galaxies (about 2 resolution
elements) provided that the signal to noise of the data is larger that 2-3. It
can also be run automatically thanks to its source-detection and first-estimate
modules, which make it suitable for the analysis of large 3D datasets. These
features make 3D-Barolo a uniquely useful tool to derive reliable kinematics
for both local and high-redshift galaxies from a variety of different
instruments including the new-generation IFUs, ALMA and the SKA pathfinders.
