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For refcode 1988ApJ...330..579P:
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1988ApJ...330..579P DISTANCES TO THE VIRGO AND URSA MAJOR CLUSTERS AND A DETERMINATION OF H_0_ MICHAEL J. PIERCE AND R. BRENT TULLY Institute for Astronomy, University of Hawaii Received 1987 October 23; accepted 1988 January 14 ABSTRACT Multicolor CCD photometry of spiral galaxies within the Ursa Major and Virgo Clusters is presented and combined with accurate 21 cm H I line-width measurements in order to investigate the luminosity-line-width relations (Tully-Fisher [hereafter TF] relations) as a distance indicator. There is evidence for a slight morphological-type dependence of the TF relations, although the effect is present only at the 1-2 {sigma} level. No difference in the slope of the TF relations is found between the two clusters, despite the considerable difference in densities and crossing times. A significant reduction in the dispersion of the TF relations is made possible from both accurate total magnitudes and accurate inclinations derived from ellipse fitting to galaxy isophotes. As a result, galaxies with inclinations as low as 30^deg^ can now be included in the sample. In the Ursa Major Cluster, the intrinsic dispersion in the TF relations is found to be only ~0.25 mag. We show that the use of aperture magnitudes (e.g., H band data) results in an artificially large slope to the TF relations. The use of total magnitudes yields a slope of ~8 at near-infrared wavelengths, as a result L is proportional to V^3.2^_max_. An absolute calibration of the TF relations was obtained by fitting to three nearby galaxies with reasonably accurate distances: M31, M33, and NGC 2403. These systems establish the distance to the Ursa Major Cluster to be 15.5 +/- 1.2 Mpc and the mean distance to the Virgo Cluster to be 15.6 +/- 1.5 Mpc, with slightly greater uncertainty due to the possible presence of superposed galaxies. A determination of the value of the Hubble Constant was made by assuming a Virgocentric flow of 300 km s^-1^ at the Local Group, yielding a derived value of H_0_ = 85 +/- 10 km s^-1^ Mpc^-1^. Subject headings: cosmology - galaxies: clustering - galaxies: distances - galaxies: photometry - radio sources: 2l cm radiation
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