Gas-rich dwarfs from the PSS-II. III. HI profiles and dynamical masses

We present Arecibo neutral hydrogen data on a sample of optically selected dwarf galaxies. The sample ranges in H I mass from 10(6) to 5 x 10(9) M., with a mean of 7.9 x 10(8) M,. Using estimated H I radii, the H I surface densities range from 0.6 to 20 M, pc(-2), all well below the critical threshold for star formation (Kennicutt 1998). M-HI/L values of the LSB dwarfs range from 0.3 to 12 with a mean value of 2.0. Dynamical masses, calculated from the H I profile widths, range from 10(8) to 10(11) M.. There is a strong correlation between optical luminosity and dynamical mass for LSB dwarfs implying that the dark matter (whether baryonic or nonbaryonic) follows the detectable baryonic matter.