Kinematics and neutral hydrogen properties of the giant low surface brightness galaxy UGC 2936

We present high-sensitivity, high-velocity resolution VLA H I observations of the giant low surface brightness (LSB) galaxy, UGC 2936. Like the giant LSBs presented in Pickering et al., UGC 2936 is a large and massive galaxy. Its H I mass is nearly 10(10) M-circle dot h(75)(-2), it has detectable H I extending beyond 30 kpc h(75)(-1), and it is a fast rotator (V-max simila r or equal to 250 km s(-1)) with a slowly rising rotation curve. This galax y also exhibits warping in the outermost isophotes of the optical images th at appears to be visible in the H I distribution and kinematics as well. Th is galaxy's high inclination and relatively large amount of Her emission pr ovides a unique opportunity to compare high-quality H I and optical rotatio n curves in the same LSB galaxy. The optical and H I data show good agreeme nt as long as the effects of beam smearing on the H I rotation curve are ta ken into account. A large part of the disk of UGC 2936 lies above the criti cal density for star formation as described by Kennicutt. This is consisten t with the relatively large amount of star formation occurring within the d isk of this galaxy and perhaps brings into question whether this galaxy sho uld be considered a true LSB galaxy.