| Abstract | Neutral hydrogen was detected in 36 out of 46 galaxies observed at 21-cm wavelength. Eighteen of the larger ones were partially mapped, and estimates of hydrogen and total mass obtained. Without correction for optical-depth effects, median values hydrogen mass and the ratio of hydrogen to total mass were 7.5 billion solar masses and 0.07, respectively. These values are similar to the average values found previously for Sc-Scd galaxies (the median morphological type for the sample). The lowest hydrogen/total mass ratios were found for NGC 253 and 4945, probably because of absorption of the nuclear continuum in addition to any hydrogen self-absorption. |
