Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991trcl.book.....d&link_type=abstract
The Tully-Fisher relation for the CO line., by Dickey, J. M.; Kazes, I.. Minnesota Univ., Minneapolis (USA). Dept. of Astronomy
Astronomy and Astrophysics
Astronomy
Scientific paper
The question addressed is whether linewidths measured in CO emission can be used in the Tully-Fisher relation as a substitute or supplement to H I linewidths. To answer this question the authors have observed a test sample of galaxies in the Coma-A1367 supercluster using the IRAM 30 m telescope to measure CO linewidths for comparison with λ-21 cm linewidths from Arecibo. The galaxies were selected to span a very broad range of H I linewidths and to have simple, two-horned line shapes at λ21-cm. For those detections with good signal to noise the authors find a nearly perfect correlation between linewidths in CO and H I. Thus there is no question that CO linewidths will correlate well with absolute magnitude as in the Tully-Fisher relation. Using model line profiles they investigate the effect of different radial distributions of gas on line shapes and widths. Eventually they hope to use CO to improve on distance estimates using the Tully-Fisher relation, and to extend its use to more distant galaxies and clusters than H I telescopes can reach.
Dickey John M.
Kazes Ilya
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