H I and optical observations of dwarf galaxies

Details H I and optical observations of dwarf galaxies H I and optical observations of dwarf galaxies

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..334s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 2, Sept. 15, 1992, p. 334-346.

Astronomy and Astrophysics

Astronomy

99

Astronomical Photometry, Compact Galaxies, Dwarf Galaxies, Interstellar Matter, Optical Emission Spectroscopy, Dark Matter, H I Regions, Luminous Intensity, Lyman Alpha Radiation, Optical Properties, Universe

Scientific paper

H I observations have been made with the 76-m Lovell Telescope of 36 galaxies of the blue compact and the low surface brightness type, of which 23 are true dwarfs and 31 have optical diameters less than 10 kpc. Photoelectric photometry from the Kitt Peak 2.1-m telescope reveals systematic errors in previous studies. The observations confirm the relative hydrogen richness of dwarf galaxies and indicate an increase in gas richness with decreasing luminosity. The distribution of intrinsic dwarf galaxy shapes is derived and applied to the statistical calculation of dwarf galaxy total masses, taking into account support by internal pressure. The contribution of dwarf galaxies to the total luminosity density in the nearby universe is about 10 percent and their H I contributions about 30 percent.

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