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1996AJ....112.1759D PECULIAR VELOCITIES FOR GALAXIES IN THE GREAT WALL. I. THE DATA IAN P. DELL'ANTONlO Bell Laboratories, Lucent Technologies, 700 Mountain Avenue, Murray Hill, New Jersey 07974 Electronic mail: ian@physics.att.com GREGORY D. BOTHUN Department of Physics, University of Oregon, 120 Willamette Hall, Eugene, Oregon 97403 Electronic mail: nuts@moo.uoregon.edu MARGARET J. GELLER Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 Electronic mail: mjg@cfa.harvard.edu Received 1996 March 20; revised 1996 July 17 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 {sigma} ~ 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).
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