Abstract
We have taken advantage of the improved baselines and higher sensitivity available with the upgraded Arecibo 305 m telescope to create a new H I spectral line catalog of disk galaxies that can be used as a reference catalog for anyone interested in 21 cm spectral line work. In all 108 galaxies were observed, covering 24 hr of the sky at declinations between 0° and 36° and velocities between 0 and 25,000 km s-1. The majority of the galaxies were observed at least two times on different nights to avoid problems with radio frequency interference, baseline fluctuations, etc. Comparing our measured values with all those available in the literature shows that although large individual variations may exist, the average difference between the measurements is zero. In all we have considerable confidence in our measurements, and the resulting catalog should be extremely useful as a well-defined reference catalog for anyone interested in 21 cm spectral line work.
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