Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...114..208v&link_type=abstract
Astronomy and Astrophysics, vol. 114, no. 1, Oct. 1982, p. 208-210.
Astronomy and Astrophysics
Astrophysics
31
Galactic Clusters, H Lines, Mass Ratios, Radio Galaxies, X Ray Sources, Centimeter Waves, Galactic Structure, Hydrogen Clouds, Mass To Light Ratios, Neutral Gases
Scientific paper
A small 21 cm line survey of five cD galaxies, all first ranked cluster members, and all except one known to be centered on an extended X-ray source, is reported. Rms noise values for each object as obtained after smoothing the signals are listed. Estimated upper limits of the H I flux and an average flux upper limit of twice the rms over the whole width are used to estimate an upper limit of the neutral hydrogen mass. Hydrogen mass is computed to photographic luminosity ratios, with no correction applied to the optical luminosity of the galaxies except the one that allows for galactic extinction. Dressler's (1979) three component cD galaxy model is scaled to the sample galaxies and, assuming that the H I velocity distribution follows that of the stars, an upper limit to the hydrogen mass to total mass ratio in
Giovanelli Riccardo
Valentijn Edwin. A.
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