1999/01/24 by T. Shanks, Shanks, T.
Decision Sciences · Mathematics · Physics and Astronomy · #Advanced Statistical Methods and Models #Astrophysics (astro-ph) #FOS: Physical sciences #Scientific Measurement and Uncertainty Evaluation #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9901335
7 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
arxiv created 1999/01/24 · openalex publication_date 1999/01/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/27 · openalex updated_date 2026/07/28
We update and extend the results of Shanks (1997, MNRAS, 290, L77) by making\na direct test of Tully-Fisher distance estimates to thirteen spiral galaxies\nwith HST Cepheid distances and to ten spiral galaxies with Type Ia supernova\n(SNIa) distances. The results show that the Tully-Fisher distance moduli are\ntoo short with respect to the Cepheid distances by 0.46+-0.11mag and too short\nwith respect to the SNIa distances by 0.49+-0.18mag. Combining the HST Cepheid\nand the best SNIa data suggests that, overall, previous Tully-Fisher distances\nat v~1000 kms-1 were too short by 0.43+-0.09mag, a result which is significant\nat the 4.6 sigma level. These data therefore indicate that previous\nTully-Fisher distances should be revised upwards by 22+-5% implying, for\nexample, a Virgo distance of 19.0+-1.8Mpc. The value of Ho from Tully-Fisher\nestimates is correspondingly revised downwards from Ho=84+-10kms-1Mpc-1 to\nHo=69+-8kms-1Mpc-1. There is evidence that the Tully-Fisher relation at large\ndistances is affected by Malmquist bias. In this case, we argue that\nHo<50kms-1Mpc-1 cannot be ruled out by Tully-Fisher considerations.\n