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The Value of Ho

Published online by Cambridge University Press:  30 March 2016

G. A. Tammann  and
A. Sandage
G. A. Tammann
Affiliation:
Astronomisches Institut der Universität Basel, European Southern Observatory
A. Sandage
Affiliation:
Mount Wilson and Las Campanas Observatories

Abstract

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A brief discussion of the systematic effects of selection bias on the extragalactic distance scale is given. Distance indicators with intrinsic scatter yield only upper limits to Ho, unless the true intrinsic scatter is either small or well determined. Several distance indicators (luminosity index, diameters, globular clusters, 21 cm line widths) are discussed. It is concluded that type I supernovae, calibrated through brightest M supergiants, yield presently the most reliable determination of the large-scale value of the Hubble constant, i.e. Ho(cosmic) = 50 ± 7 km s–1 Mpc–1.

Information

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 6 , 1983 , pp. 301 - 313
Copyright
Copyright © Reidel 1983

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