Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..861v&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 680, p. 861-883.
Astronomy and Astrophysics
Astronomy
98
Galactic Clusters, Hubble Constant, Local Group (Astronomy), Andromeda Galaxy, Distance, Dwarf Galaxies, Irregular Galaxies, Virgo Galactic Cluster
Scientific paper
A critical review of distance determinations to individual galaxies, groups, and clusters is presented. All modern distance determinations have been reduced to a common and internally consistent system. These distances are used to discuss the present status of the extragalactic distance scale and of the Hubble parameter, H0. It is shown that the classical distance-scale problem starts quite abruptly at D of greater than or approximately equal to 3 Mpc. From eight different techniques the mean distance modulus of the Virgo cluster is found to be 31.0 +/- 0.15. Twelve determinations of the difference between the distance moduli of the Coma and Virgo clusters yield 3.71 +/- 0.05 mag and hence a Coma distance modulus of 34.71 +/- 0.16. Combining this distance with the coma cluster's cosmological velocity of 7210 km/s yields a value H0 (local) = 83 +/- 6 km/s Mpc. The cluster data do not show a statistically significant difference between the local and global values of the Hubble parameter.
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