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The Linearity of the Cosmic Expansion Field and the Value of the Hubble Constant

Published online by Cambridge University Press:  25 May 2016

G. A. Tammann
G. A. Tammann*
Affiliation:
Astronomisches Institut der Universität Basel, Venusstr. 7, CH-4102 Binningen, Switzerland

Abstract

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A linearity test shows H0 to decrease by 7% out to 18 000 km s–1. The value at 10 000 km s–1 is a good approximation to the mean value of H0 over very large scales. The construction of the extragalactic distance scale is discussed. Field galaxies, cluster distances relative to Virgo, and blue supernovae of type Ia yield H0 (cosmic) with increasing weight; they give consistently H0 = 57 ± 7 (external error). This value is supported by purely physical distance determinations (SZ effect, gravitational lenses, MWB fluctuations). Arguments for H0 > 70 are discussed and shown to be flawed.

Type
I. Cosmological Parameters, H0, q0, Ω0 and Λ
Information
Symposium - International Astronomical Union , Volume 183: Cosmological Parameters and the Evolution of the Universe , 1999 , pp. 31 - 47
Copyright
Copyright © Kluwer 1999 

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