Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.299..297v&link_type=abstract
Nature, vol. 299, Sept. 23, 1982, p. 297, 298.
Astronomy and Astrophysics
Astronomy
9
Astrometry, Hubble Constant, Astronomical Coordinates, Distance, Luminosity, Virgo Galactic Cluster
Scientific paper
Current methods for determining the Hubble constant are reviewed and suggestions are offered for more accurate determinations of the Hubble parameter. Comparisons are made with calculations of the 21-cm line width as opposed to blue luminosity relations for galaxies when using the Cepheids, RR Lyrae, and novae, the 21-cm line width versus IR luminosity relation for spirals when using the Local Group galaxies M 31 and M 33, and determination of the maximum luminosity of type I supernovae from observations of the brightest red supergiants. Errors are cited in estimating distances to the Virgo Cluster, for which mean velocities of 967 km/sec, within 53 km/sec, are calculated from 160 radial velocities of Virgo Cluster members. Deviations are also great in the observed large scale anisotropies of galaxian velocity fields, where large holes exist between the galaxies and display velocity anomalies of 100-350 km/sec. The use of light sources in distant galaxies as standard candles and meter sticks is asserted to offer an opportunity for measurements free from errors present in calculations based on observations of objects within the Local Supercluster.
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