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We present Arecibo neutral hydrogen data on a sample of optically selecteddwarf galaxies. The sample ranges in HI mass from 10^6 M_sun to 5x10^9 M_sun,with a mean of 7.9x10^8 M_sun. Using estimated HI radii, the HI surfacedensities range from 0.6 to 20 M_sun pc^-2, all well below the criticalthreshold for star formation (Kennicutt 1998). M_HI/L values of the LSB dwarfsrange from 0.3 to 12 with a mean value of 2.0. Dynamical masses, calculatedfrom the HI profile widths, range from 10^8 M_sun to 10^11 M_sun. There is astrong correlation between optical luminosity and dynamical mass for LSB dwarfsimplying that the dark matter (whether baryonic or non-baryonic) follows thedetectable baryonic matter.

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