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For refcode 1997ApJ...475..399T:
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Copyright by American Astronomical Society. Reproduced by permission
1997ApJ...475..399T The SBF Survey of Galaxy Distances. I. Sample Selection, Photometric Calibration, and the Hubble Constant JOHN L. TONRY AND JOHN P. BLAKESLEE Physics Department, Room 6-204, MIT, Cambridge, MA 02139; jt@antares.mit.edu, john@arneb.mit.edu EDWARD A. AJHAR Kitt Peak National Observatory, National Optical Astronomy Observatories, P.O. Box 26732, Tucson, AZ 85726; ajhar@noao.edu AND ALAN DRESSLER Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101; dressler@omega.ociw.edu Received 1996 June 24; accepted 1996 August 26 ABSTRACT We describe a program of surface brightness fluctuation (SBF) measurements for determining galaxy distances. This paper presents the photometric calibration of our sample and of SBF in general. Basing our zero point on observations of Cepheid variable stars, we find that the absolute SBF magnitude in the Kron-Cousins I band correlates well with the mean (V - I)_0_ color of a galaxy according to M^bar^_I_ = (-1.74 +/- 0.007)+(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 function (PNLF), Tully-Fisher (TF), D_n_-{sigma}, SN II, and SN Ia, demonstrate that the calibration of SBF is universally valid and that SBF error 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 present SBF distances to 12 nearby groups of galaxies where Cepheids, SN II, and SN Ia have been observed. Subject headings: distance scale-galaxies: clusters: general -galaxies: distances and redshifts-galaxies: photometry
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