Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228...81v&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Feb. 15, 1979, p. 81-94.
Astronomy and Astrophysics
Astrophysics
24
Astronomical Photometry, Elliptical Galaxies, Galactic Clusters, Hubble Diagram, Radial Velocity, Red Shift, Spiral Galaxies, Cosmology, Isophotes, Magnitude, Velocity Distribution
Scientific paper
The local velocity deviation is studied using a sample of 311 E, S0, SB0, and SB0/a galaxies taken from the magnitude-limited Shapley-Ames catalog. Absolute magnitudes are derived by assuming that the distance modulus of the Virgo I cluster is 31.70. A plot of log radial velocity vs. reduced isophotal magnitude reveals a well-defined redshift-magnitude relation with a slope of 5. A luminosity bias is identified, and the sample is suitably adjusted to obtain a distance-limited sample from the magnitude-limited sample. An unbiased sample consisting of 159 galaxies with log radial velocity of no more than 3.40 yields a value of 50.8 km/s per Mpc for the Hubble constant, while a subsample of 104 galaxies in the region of sky containing the supergalactic equatorial belt yields a value of 52.1 + or - 2.2 km/s per Mpc. It is suggested that on the average the effects of the Local Supercluster velocity field in the uniform Hubble flow in the local region is only about 7%.
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