THE SBF SURVEY OF GALAXY DISTANCES .1. SAMPLE SELECTION, PHOTOMETRIC CALIBRATION, AND THE HUBBLE CONSTANT

We describe a program of surface brightness fluctuation (SBF) measurem ents for determining galaxy distances. This paper presents the photome tric calibration of our sample and of SBF in general. Basing our zero point on observations of Cepheid variable stars, we find that the abso lute SBF magnitude in the Kron-Cousins I band correlates well with the mean (V-I)(0) color of a galaxy according to (M) over bar(I)=(-1.74 /- 0.07) + (4.5 +/- 0.25)[(V-I)(0) - 1.15] for 1.0 < (V-I) < 1.3. This agrees well with theoretical estimates from stellar population models . Comparisons between SBF distances and a variety of other estimators, including Cepheid variable stars, the planetary nebula luminosity fun ction (PNLF), Tully-Fisher (TF), D-n-sigma, SN II, and SN Ia, demonstr ate that the calibration of SBF is universally valid and that SBF erro r estimates are accurate. The zero point given by Cepheids, PNLF, TF ( both calibrated using Cepheids), and SN II is in units of megaparsecs; the zero point given by TF (referenced to a distant frame), D-n-sigma , and SN Ia is in terms of a Hubble expansion velocity expressed in km s(-1). Tying together these two zero points yields a Hubble constant of H-0 = 81 +/- 6 km s(-1) Mpc(-1). As part of this analysis, we prese nt SBF distances to 12 nearby groups of galaxies where Cepheids, SN II , and SN Ia have been observed.