An H I survey of Nilson dwarf galaxies. II - Statistical properties

Details An H I survey of Nilson dwarf galaxies. II - Statistical properties An H I survey of Nilson dwarf galaxies. II - Statistical properties

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..680t&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, Aug. 1, 1979, p. 680-687. Research supported by the Research Corp.

Astronomy and Astrophysics

Astronomy

60

Galactic Structure, Hydrogen Atoms, Line Spectra, Microwave Spectra, Radio Sources (Astronomy), Statistical Analysis, Density Distribution, Luminosity, Radio Astronomy, Space Density, Tables (Data)

Scientific paper

Results are reported for a statistical analysis of a sample of low-surface-brightness (LSB) objects consisting of the Nilson (1973) dwarf galaxies and the DDO dwarf galaxies detected by Fisher and Tully (1975). It is concluded that: (1) the Nilson catalog is fairly complete for all galaxies with a Nilson blue diameter larger than 1 arcmin; (2) LSB objects include a broad continuum of galaxies ranging from 'true' dwarfs (absolute photographic magnitude at least -16) to more luminous (absolute photographic magnitude less than -16) but very LSB systems; (3) in general, the LSB galaxies have larger hydrogen mass/photographic luminosity ratios and hydrogen/total mass ratios than late-type galaxies of comparable luminosity, implying that only a small fraction of the total gas has been converted into stars; and (4) the LSB galaxies have a total mass/linear radius ratio 3 to 9 times smaller than that of Sdm-Sm galaxies, which may be too small for the LSB galaxies to maintain a density wave necessary for efficient star formation.

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