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For refcode 1997MNRAS.290L..77S:
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Copyright by Royal Astronomical Society. 1997MNRAS.290L..77S A test of Tully-Fisher distance estimates using Cepheids and SNIa T. Shanks Accepted 1997 September 1. Received 1997 August 29; in original form 1997 February 17 ABSTRACT We make a direct test of Tully-Fisher distance estimates to 11 spiral galaxies with Hubble Space Telescope (HST) Cepheid distances, and to 12 spiral galaxies with Type Ia supernova (SNIa) distances. The HST Cepheid distances come from the work of Freedman, Sandage et al. and Tanvir et al. The SNIa distances come from Pierce, calibrated using the Cepheid results of Sandage et al. The Tully-Fisher distances mostly come from the work of Pierce. The results show that the Tully-Fisher distance moduli are too short with respect to the Cepheid distances by 0.41 +/- 0.14 mag, and too short with respect to the SNIa distances by 0.46 + 0.19 mag. Combining the HST Cepheid and SNIa data suggests that, overall, previous Tully-Fisher distances were too short by 0.43 +/- 0.11 mag, a result which is significant at the 3.86 level. The Tully-Fisher distance errors appear to increase as galaxy linewidth decreases, which may signify the presence of Malmquist bias. These data therefore indicate that previous Tully-Fisher distances at v ~ 1000 km s^-1^ should be revised upwards by ~22 +/- 6 per cent implying, for example, a Virgo distance of 19.0 +/- 1.8 Mpc. The value of H_0_ from Tully-Fisher estimates is correspondingly revised downwards from H_0_ = 84 +/- 10 to H_0_ = 69 +/- 8 km s^-1^ Mpc^- 1^. Key words: supernovae: general - Cepheids - galaxies: distances and redshifts.
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