Galaxy types and the shape of H I profiles

Details Galaxy types and the shape of H I profiles Galaxy types and the shape of H I profiles

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58l..31s&link_type=abstract

Astronomy and Astrophysics, vol. 58, no. 3, June 1977, p. L31-L33.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Spectroscopy, Classifications, Galactic Radiation, Galactic Structure, Spectral Line Width, Astronomical Catalogs, Astronomical Models, Hydrogen, Spiral Galaxies

Scientific paper

A shape parameter is defined which relates the shape of a late-type galaxy's 21-cm H I line profile with Hubble type over the range from Sbc to Irr. This parameter comprises the ratio of flux density in the two peaks of a spiral galaxy's H I line-profile shape to that at the midpoint of the profile. Measured values of the shape parameter are given for 78 unconfused normal galaxies, and a strong decrease in the value of this parameter toward later types is observed. It is suggested that the principal change in shape parameter with Hubble type is caused by variations in the radius at which the maximum rotation velocity of a galaxy is attained. Some simple galactic models are analyzed which indicate that Sbc galaxies have rotation curves that rise three to five times faster, relative to their H I radii, than those of irregulars.

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