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The Far Field Hubble Constant 1

We used HST to obtain surface brightness fluctuation (SBF) observations of four nearby brightest cluster galaxies (BCG) to calibrate the BCG Hubble diagram of Lauer & Postman (1992). This BCG Hubble diagram contains 114 galaxies covering the full celestial sphere and is volume limited to 15,000 km s, providing excellent sampling of the far-field Hubble flow. The SBF zero point is based on the Cepheid calibration of the ground IKC method (Tonry et al. 1997) as extended to the WFPC2 F814W filter by Ajhar et al. (1997). The BCG globular cluster luminosity functions give Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under National Aeronautics and Space Administration (NASA) Contract NAS 5-26555. The National Optical Astronomy Observatories are operated by AURA, Inc., under cooperative agreement with the National Science Foundation. Visiting Astronomer Cerro Tololo Inter-American Observatory, NOAO. STScI is operated by AURA, Inc., under contract to NASA.