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The Hubble Constant

Published online by Cambridge University Press:  05 March 2013

Jeremy Mould
Jeremy Mould*
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Mount Stromlo Observatory, Weston, ACT 2611, Australia; jrm@mso.anu.edu.au
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Abstract

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With the completion of the Hubble Space Telescope (HST) Key Project on the Extragalactic Distance Scale, it is interesting to form the dimensionless quantity H0t0 by multiplying the Hubble Constant by the age of the Universe. In a matter dominated decelerating Universe with a density exceeding 0·26 of the critical value, H0t0 < 1; in an accelerating Universe with the same Ωm = 0·26, but dominated by vacuum energy with ΩV ≥ 1 – Ωm, H0t0 ≥ 1. If the first globular clusters formed 109 years after the Big Bang, then with 95% confidence H0t0 =1·0 ± 0·3. The classical Einstein–de Sitter cosmological model has H0t0 = ⅔.

Keywords

cosmology: distance scalegalaxies: formation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 17 , Issue 1 , 2000 , pp. 45 - 47
Copyright
Copyright © Astronomical Society of Australia 2000

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