The H I-properties of bright southern galaxies

Details The H I-properties of bright southern galaxies The H I-properties of bright southern galaxies

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203...21b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 1, Sept. 1988, p. 21-27.

Astronomy and Astrophysics

Astrophysics

29

Centimeter Waves, Dwarf Galaxies, H I Regions, Radio Galaxies, Southern Sky, Astronomical Catalogs, Compact Galaxies, Line Shape, Line Spectra, Morphology, Velocity Distribution

Scientific paper

The 21-cm line observations of a sample of 33 bright southern galaxies have been used to derive their H I properties by the means of a model-fit procedure. The observed line-profiles were reconstructed by the model-fit, and the fit with the smallest rms value was taken as the result. Effective H I diameters were determined along the line of maximum velocity gradient, which was assumed to be coincident with the line of nodes. The largest H I extent relative to the optical was found for the blue compact dwarf galaxy NGC 2915. These results confirm that the average mean surface density of the atomic neutral hydrogen gas is approximately constant for all galaxies independent of their morphological type (in the range Sb to Irr) or size.

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