Gas Rich Dwarfs from the PSS-II III. HI Profiles and Dynamical Masses
Jo Ann Eder, James Schombert
Abstract
We present Arecibo neutral hydrogen data on a sample of optically selected dwarf galaxies. The sample ranges in HI mass from 106 Msun to 5x109 Msun, with a mean of 7.9x108 Msun. Using estimated HI radii, the HI surface densities range from 0.6 to 20 Msun pc-2, all well below the critical threshold for star formation (Kennicutt 1998). MHI/L values of the LSB dwarfs range from 0.3 to 12 with a mean value of 2.0. Dynamical masses, calculated from the HI profile widths, range from 108 Msun to 1011 Msun. There is a strong correlation between optical luminosity and dynamical mass for LSB dwarfs implying that the dark matter (whether baryonic or non-baryonic) follows the detectable baryonic matter.
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