Gas Rich Dwarfs from the PSS-II III. HI Profiles and Dynamical Masses

Abstract

We present Arecibo neutral hydrogen data on a sample of optically selected dwarf 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 surface densities range from 0.6 to 20 M_sun 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 HI profile widths, range from 10^8 M_sun to 10^11 M_sun. 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.

53 pages, AASTeX v4.0, 8 figures, to be published in ApJ Suppl, images, tables and referee report can be found at http://zebu.uoregon.edu/~js

References in corpus (2)

• The Mass-to-Light Ratio of Binary Galaxies
• Nearby Gas-Rich Low Surface Brightness Galaxies

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