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The Value of Ho

  • G. A. Tammann (a1) and A. Sandage (a2)

Abstract

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.

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References

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The Value of Ho

  • G. A. Tammann (a1) and A. Sandage (a2)

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