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The Tully-Fisher relation for the CO line

The question addressed here is whether linewidths measured in CO emission can be used in the Tully-Fisher relation as a substitute or supplement to H I line widths. To answer this question we have observed a test sample of galaxies in the Coma-A1367 supercluster using the IRAM 30 m telescope to measure CO line widths for comparison with 21 cm line widths from the Arecibo telescope. The galaxies were selected to span a very broad range of H I line widths (113-575 km s −1 ) and to have simple, two-horned line shapes at 21 cm