101 spiral galaxies - Neutral hydrogen distribution

Details 101 spiral galaxies - Neutral hydrogen distribution 101 spiral galaxies - Neutral hydrogen distribution

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85.1312k&link_type=abstract

Astronomical Journal, vol. 85, Oct. 1980, p. 1312-1324. Research supported by the Morrison Fund

Astronomy and Astrophysics

Astronomy

51

Galactic Structure, Hydrogen Clouds, Neutral Gases, Spiral Galaxies, Astronomical Catalogs, Centimeter Waves, Luminous Intensity, Statistical Analysis

Scientific paper

The neutral hydrogen properties of spiral galaxies have been measured at the Arecibo Observatory using a 21 cm spectral line system. One hundred and thirty galaxies were observed, and 101 have been detected and roughly mapped in H I. The data are used to derive the total mass of neutral hydrogen gas, the gravitational mass, and a Gaussian hydrogen diameter for some galaxies. A large scatter in H I diameters within each Hubble type is reported and Sc galaxies appear to have smaller H I diameters than Sb galaxies. Sb galaxies also show a strong tendency to have asymmetric H I distributions. The H I profile is measured with the width at 50% the peak flux, and comparisons are made with the Green Bank method.

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