| Abstract | We construct the I-band Tully-Fisher relation (IRTF) for a sample of galaxies in the redshift space vicinity of the Great Wall. We measure isophotal and total I-band magnitudes for the galaxies and use the Arecibo 305 m to obtain 20% and 50% linewidths for the galaxies. We construct TF relations from these data. The derived TF zero point for this relation is M_0_ = -19.73, and the TF slope is b = 8.34, with scatter σ ~ 0.30- 0.32. We use the 20% linewidth relation for a study of the peculiar velocity field in a separate paper [Dell'Antonio et al. 1996, ApJ, submitted (Paper II)]. We also investigate the effects of extinction on the IRTF. The data are consistent with a moderate internal extinction (Bothun et al. 1992, ApJ, 395,347), and are inconsistent with the strong internal extinction correction proposed by Bernstein et al. (1994, AJ, 107, 1962). |
