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The Local Velocity Field and the Hubble Constant

Published online by Cambridge University Press:  25 May 2016

G. A. Tammann  and
Allan Sandage
G. A. Tammann
Affiliation:
Astronomisches Institut der Universität Basel, Venusstrasse 7, CH-4102, Binningen, Switzerland
Allan Sandage
Affiliation:
The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena CA 91101

Abstract

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The methods are reviewed that give a distance modulus to the core of the Virgo cluster of m - M = 31.64 ± 0.08 (D = 21.3 ± 0.8 Mpc). It is shown that the cosmic velocity of the cluster core is 1179 ± 17 km s−1, which, when combined with the distance gives Ho = 55 ± 3 km s−1Mpc−1 from the Virgo cluster data alone. Nine independent methods are reviewed that confirm that Ho = 50 ± 2. Discussion is made why all methods that are said to give the short distance scale (Ho ~ 85) are incorrect.

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