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IC 4921


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Cluster population incompleteness bias and the value of H(0) from the Tully-Fisher B0(T) relation
Data on the Virgo cluster and ten more distant clusters are the basis ofan evaluation of the influence of the cluster population incompletenessbias on the B-band Tully-Fisher relation. The data are well fitted by atheoretical curve that is obtained for a Hubble constant value of 72 +or - 5 km/sec per Mpc in the de Vaucouleurs local scale, confirming theconstant's previous determination in light of a study of the Malmquistbias for field galaxies. The true value for the Hubble constant isconcluded to lie within the 50-75 range, depending on the primarycalibration.

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Observation and Astrometry data

Constellation:Pavo
Right ascension:20h03m18.90s
Declination:-67°49'30.0"
Aparent dimensions:0.741′ × 0.389′

Catalogs and designations:
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ICIC 4921
HYPERLEDA-IPGC 64037

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