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The Hubble Constant and the Deceleration Parameter

Published online by Cambridge University Press:  07 February 2017

G. A. Tammann
G. A. Tammann*
Affiliation:
Astronomisches Institut der Universität Basel, Binningen, Switzerland Hamburger Sternwarte, Hamburg–Bergedorf, F.R.G.

Abstract

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A preliminary report is given of recent work with A. Sandage on the Hubble constant. Through a chain of distance indicators in Sc and Ir galaxies (cepheids, brightest stars, H iiregions, and luminosity classes) the distance scale is carried beyond any possible local anisotropy of the velocity field. Special care is taken to allow for the dependence of the intrinsic properties of the distance indicators on the size of the parent galaxy, and for the effect of the Malmquist correction. H0 is found to be 55 ± 7 km s-1 Mpc-1; within the errors no systematic changes with distance were found.

A formal value of the deceleration constant q0 = 1 ± 1 was recently derived by Sandage (1972a) and Sandage and Hardy (1973). The most important correction to this value is probably the luminosity evolution of galaxies, which tends to push q0 below 0.5. The ensuing evidence for an open universe is also favored by independent arguments.

Type
Part I: The Contemporary Structure and Dynamics of the Universe
Information
Symposium - International Astronomical Union , Volume 63: Confrontation of Cosmological Theories , 1974 , pp. 47 - 59
Copyright
Copyright © Reidel 1974 

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