NEUTRAL HYDROGEN STUDIES OF GALAXIES WITH A SINGLE SPACING INTERFEROMETER

Abstract : A total of 79 galaxies were investigated with the Owens Valley Observatory's two-element interferometer for content of neutral hydrogen. The baseline used was 100 ft east-west, and the filter bandwidth was 100 kHz. Thirty of the galaxies had detectable emission. The results are presented as line and position profiles for each galaxy. An extensive investigation of model profiles is also presented for the purposes of interpretation of the observed results. It is shown that while in most cases the position profile cannot be directly interpreted as the rotation curve, the model analysis does suggest a method for estimating the rotational characteristics of the galaxies from the profiles. Using the estimated rotational parameters, total masses were calculated and are presented along with other quantities that describe the character of the galaxies. All of the irregular galaxies that were detected were found to be rotating, with the exception of WLM, which was inconclusive. (Author)