Hubble flows in the Pisces-Perseus region from the Giovanelli-Haynes Galaxy sample

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmology, Galactic Clusters, Astronomical Photometry, Distance, Hubble Constant, Spatial Distribution

Scientific paper

Results are presented of an analysis made of the Hubble flow for galaxies in the Pisces-Perseus supercluster region using the Tully-Fisher (TF) relation in the B band, applied to the sample of Giovanelli and Haynes (1985). Various statistical errors caused by the dispersion of TF relations, observational selection effects, and an inhomogeneous spatial distribution of galaxies are examined on the basis of a data set containing 1119 galaxies. Full control over the Malmquist bias was found to be essential in deriving the result. The recession of galaxies is described well by a universal Hubble constant for all galaxies up to a redshift of 10,000-15,000 km/s, with the exception of those located within 2000 km/s, for which the sample is clearly affected by an inflow. Full consistency was found with the H-band TF analysis of Aaronson et al. (1980, 1982, 1986) for their galaxy sample.

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