Gas‐rich Dwarfs from the PSS‐II. III. H i Profiles and Dynamical Masses

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Abstract
We present Arecibo neutral hydrogen data on a sample of optically selected dwarf galaxies. The sample ranges in H I mass from 106 to 5 × 109 M☉, with a mean of 7.9 × 108 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/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 108 to 1011 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.
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