Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..423s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Feb. 1, 1990, p. 423-427.
Astronomy and Astrophysics
Astronomy
9
Cosmology, Distance, Extragalactic Radio Sources, Red Shift, Astronomical Models, Hubble Constant, Local Group (Astronomy), Virgo Galactic Cluster
Scientific paper
The chronometric cosmology provides a close fit to the proper-motion/redshift relation compiled by Cohen et al. (1988), consistently with isotropy of the directions of motion. No adjustable cosmological parameters or evolution are required, but the radius R of the universe can be estimated in a statistically consistent way from the directly observed data. On the basis of the present sample, R is estimated as 160 + or - 40 Mpc; the corresponding values of the Hubble ratio cz/r are 5, 55, and 95 at the Local Group, Virgo, and z = 0.01, reconciling disparate ladder-based estimates. The data indicate a velocity of separation of the order of 0.96c with small dispersion, of the order of 2 percent. The directions of motion of the individual sources are also estimated.
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