Neutral Gas Distribution and Kinematics of the Nearly Face-on
Spiral Galaxy NGC 1232
van Zee, L.,& Bryant, J. 1999, AJ, 118, 2172
Abstract
We have analyzed high velocity resolution H I synthesis observations
of the nearly face-on Sc galaxy NGC 1232. The neutral gas distribution
extends well beyond the optical extent of the galaxy. As expected,
local peaks in the H I column density are associated with the spiral
arms. Further, the H I column density drops precipitously near the
center of the galaxy. Closed contours in the velocity field suggest
either that the system is warped or that the rotation curve declines.
The velocity dispersion is approximately constant, with
a median value of 9.9 +/- 1.8 km/s. When corrected for rotational broadening,
there is no indication of a radial trend in the neutral gas velocity
dispersion in this galaxy.
ADS abstract