Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..255f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 266, NO. 1/JAN, P. 255, 1994
Astronomy and Astrophysics
Astronomy
9
Scientific paper
The southern spiral galaxies data of Mathewson et al. are analysed. In the clusters the deviations from an inverse Tully-Fisher relation are correlated with deviations from a diameter-magnitude relation. This implies a additional parameter in the Tully-Fisher relation. When this diameter effect is taken into account, regions away from the general direction of the Great Attractor show a smooth Hubble flow out to at least V_CMB_ = 8000 km s^-1^. The Mathewson et al. data in the general direction of the Great Attractor are consistent with either a net flow towards our Galaxy for objects at distances of about 8000 km s^-1^ or a quiet Hubble flow at this distance. Direct measurements of all the quantities required for a definitive application of the diameter term to the absolute calibration of the Tully-Fisher relation are not yet available. However, the use of the best current estimates of the quantities involved leads to a provisional estimate for the Hubble constant of H_0_ = 53 km s^-1^ Mpc^-1 rather than about 85 km s^-1^ Mpc^-1^, the value obtained when the diameter effect is neglected.
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