The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXIV. The Calibration of Tully-Fisher Relations and the Value of the Hubble Constant
Kelson, Daniel D.; Illingworth, Garth D.; Huchra, John P.; Madore, Barry F.; Freedman, Wendy L.; Macri, Lucas M.; Gibson, Brad K.; Stetson, Peter B.; Ferrarese, Laura; Graham, John A.; Mould, Jeremy R.; Ford, Holland C.; Hughes, Shaun M. G.; Sakai, Shoko; Silbermann, N. A.; Han, Mingsheng; Kennicutt, Robert C., Jr.; Sebo, Kim
United States, Australia, United Kingdom, Canada
Abstract
This paper presents the calibration of BVRIH-0.5 Tully-Fisher relations based on Cepheid distances to 21 galaxies within 25 Mpc and 23 clusters within 10,000 km s-1. These relations have been applied to several distant cluster surveys in order to derive a value for the Hubble constant, H0, mainly concentrating on an I-band all-sky survey by Giovanelli and collaborators, consisting of total I magnitudes and 50% line width data for ~550 galaxies in 16 clusters. For comparison, we also derive the values of H0 using surveys in the B and V bands by Bothun and collaborators, and in H band by Aaronson and collaborators. Careful comparisons with various other databases from the literature suggest that the H-band data, which have isophotal magnitudes extrapolated from aperture magnitudes rather than total magnitudes, are subject to systematic uncertainties. Taking a weighted average of the estimates of Hubble constants from four surveys, we obtain H0=71+/-4 (random)+/-7 (systematic). We have also investigated how the value of H0 is affected by various systematic uncertainties, such as the internal extinction correction method used, Tully-Fisher slopes and shapes, a possible metallicity dependence of the Cepheid period-luminosity relation, and cluster population incompleteness bias.