Effective H I diameters of galaxies

Details Effective H I diameters of galaxies Effective H I diameters of galaxies

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122..273f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 273-281.

Astronomy and Astrophysics

Astronomy

10

Galactic Structure, Hydrogen, Interstellar Gas, Radio Astronomy, Centimeter Waves, Diameters, Spiral Galaxies, Star Distribution

Scientific paper

A large homogeneous sample of effective H I diameters of galaxies has been compiled by adding 98 new measurements for galaxies observed in the 21 cm line with the Nancay radiotelescope to 140 previously published ones. With this catalogue, some previously discordant conclusions about the extension of the gaseous component in galaxies are reanalyzed. Within one specific morphological type (Sc), the gas extension is uncorrelated with the stellar one and both show a small intrinsic dispersion (about 20 percent). From type to type, they decrease by a factor of 4-5 from Sab to Im galaxies. The ratio of H I to optical diameters still show a slight variation along the sequence of morphological types; it decreases from S0(-) to Scd galaxies and then it increases from Sd to Im galaxies.

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