Abstract
A study of the Tully-Fisher relation (TFR) in H, I, and B filter bands using high-quality data for 25 Coma-region spirals confirms the common suspicion that the infrared TFRs have lower scatter than the blue TFR. We find, however, that the I-band TFR has equivalent or slightly lower scatter (0.10 mag RMS!) than the H-band TFR, and that internal extinction corrections are important even in H band, so that infrared array detectors offer little advantage over I-band CCD data for TFR surveys. Extensions to the 25-galaxy sample, and comparisons with other authors, show that there are spirals which depart by 1 mag or more from the original infrared TFR, and that the slope of the TFR may vary. There are hints that I - H colors may be useful in detecting and diagnosing the differences between spirals which have common rotation speeds yet have up to threefold discrepancies in infrared luminosity.
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