The case for H0 roughly 55 from the 21 centimeter linewidth absolute magnitude relation for field galaxies

Details The case for H0 roughly 55 from the 21 centimeter linewidth absolute magnitude relation for field galaxies The case for H0 roughly 55 from the 21 centimeter linewidth absolute magnitude relation for field galaxies

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331..605s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 15, 1988, p. 605-619.

Other

71

Galaxies, Hubble Constant, Spectral Line Width, Virgo Galactic Cluster, Bias, Brightness Distribution, H I Regions, Red Shift

Scientific paper

It is argued that the high value of the Hubble constant H0 near 100 obtained consistently in some programs that use the 21 cm linewidth correlation with H-band absolute magnitude is too large due to statistical bias in the field galaxy catalogs, insufficiently corrected for. The consequence of the bias is that an apparent increase of H0 with distance is an artifact caused by use of flux-limited samples. The Tully-Fisher (TF) method is applied to the Kraan-Korteweg and Tammann (KKT) distance-limited 500 km/s local galaxy sample, and a value of H0 = 56 + or - 13 km/s/Mpc is obtained. Larger values reaching as high as H0 - 68 + or - 18 are obtained from the flux-limited catalogs used here, after attempting to correct them for bias. It is concluded that incompleteness of the present flux-limited catalogs makes the values obtained in this way uncertain. It is argued that no presently available distance-limited 21 cm samples exist other than the KKT catalog with which to obtain an unaided value of H0 using the TF method.

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