A Test of Tully-Fisher Distance Estimates Using Cepheids and Type Ia Supernovae

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dc.creatorShanks, T.
dc.date1999-01-24
dc.date.accessioned2026-07-07T02:30:09Z
dc.date.available2026-07-07T02:30:09Z
dc.descriptionWe update and extend the results of Shanks (1997, MNRAS, 290, L77) by making a direct test of Tully-Fisher distance estimates to thirteen spiral galaxies with HST Cepheid distances and to ten spiral galaxies with Type Ia supernova (SNIa) distances. The results show that the Tully-Fisher distance moduli are too short with respect to the Cepheid distances by 0.46+-0.11mag and too short with respect to the SNIa distances by 0.49+-0.18mag. Combining the HST Cepheid and the best SNIa data suggests that, overall, previous Tully-Fisher distances at v~1000 kms-1 were too short by 0.43+-0.09mag, a result which is significant at the 4.6 sigma level. These data therefore indicate that previous Tully-Fisher distances should be revised upwards by 22+-5% implying, for example, a Virgo distance of 19.0+-1.8Mpc. The value of Ho from Tully-Fisher estimates is correspondingly revised downwards from Ho=84+-10kms-1Mpc-1 to Ho=69+-8kms-1Mpc-1. There is evidence that the Tully-Fisher relation at large distances is affected by Malmquist bias. In this case, we argue that Ho<50kms-1Mpc-1 cannot be ruled out by Tully-Fisher considerations.
dc.description7 pages, 2 Figures, submitted to the proceedings of the conference "Harmonizing Cosmic Distance Scales in a Post-Hipparcos Era", 14-16 Sept 1998, Strasbourg, eds D. Egret and A. Heck, ASP Conference Series
dc.identifierhttps://arxiv.org/abs/astro-ph/9901335
dc.identifierhttp://arxiv.org/abs/astro-ph/9901335
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13731
dc.subjectAstrophysics
dc.titleA Test of Tully-Fisher Distance Estimates Using Cepheids and Type Ia Supernovae
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