The luminosity classes of galaxies and the Hubble constant

Details The luminosity classes of galaxies and the Hubble constant The luminosity classes of galaxies and the Hubble constant

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....51..275b&link_type=abstract

Astronomy and Astrophysics, vol. 51, no. 2, Sept. 1976, p. 275-282.

Astronomy and Astrophysics

Astrophysics

27

Galactic Radiation, Hubble Diagram, Luminous Intensity, Calibrating, Galaxies, H Ii Regions, Tables (Data)

Scientific paper

It is shown that the data used by Sandage and Tammann to derive a value for the Hubble constant were biased. The bias appears to be related to the extrapolation of the luminosity classes I, I-II, and II of the relation a = -96.5 LC + 557, where a is the mean value of the linear diameter of the largest H II regions and LC is the luminosity class. Two distance indicators adopted by Sandage and Tammann are not independent. A new magnitude calibration of the luminosity classes is obtained with the aid of Van den Bergh (1960) data, and this leads to a value of the Hubble constant of 76 plus or minus 8 km per sec per Mpc instead of 55 plus or minus 6.

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