The RINGS Survey I: Halpha and HI Velocity Maps of Galaxy NGC 2280
  Precise measurements of gas kinematics in the disk of a spiral galaxy can be
used to estimate its mass distribution. The Southern African Large Telescope
(SALT) has a large collecting area and field of view, and is equipped with a
Fabry-Perot interferometer that can measure gas kinematics in a galaxy from the
Halpha line. To take advantage of this capability, we have constructed a sample
of 19 nearby spiral galaxies, the RSS Imaging and Spectroscopy Nearby Galaxy
Survey (RINGS), as targets for detailed study of their mass distributions and
have collected much of the needed data. In this paper, we present velocity maps
produced from Halpha Fabry-Perot interferometry and HI aperture synthesis for
one of these galaxies, NGC 2280, and show that the two velocity measurements
are generally in excellent agreement. Minor differences can mostly be
attributed to the different spatial distributions of the excited and neutral
gas in this galaxy, but we do detect some anomalous velocities in our Halpha
velocity map of the kind that have previously been detected in other galaxies.
Models produced from our two velocity maps agree well with each other and our
estimates of the systemic velocity and projection angles confirm previous
measurements of these quantities for NGC 2280.
