Astronomy and Astrophysics – Astronomy
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.255..124r&link_type=abstract
Nature, vol. 255, May 8, 1975, p. 124, 125. Research supported by the National Research Council of Canada.
Astronomy and Astrophysics
Astronomy
5
Astronomical Models, Big Bang Cosmology, Red Shift, Angular Distribution, Diameters, Distance, Inhomogeneity, Intergalactic Media, Scintillation
Scientific paper
Important effects on the angular diameter-redshift relation caused by small-scale inhomogeneities are pointed out. It is shown that, if the lines of sight to distant sources do not pass too close to intervening galaxies (zero shear), the distance-redshift relations for inhomogeneous Friedmann models of the universe can be expressed as a simple hypergeometric differential equation which gives the solid angle distance as a function of the acceleration parameter, the redshift of the source, and the inhomogeneity factor. The redshifts of minimum angular diameter are calculated as a function of the acceleration parameter and the inhomogeneity factor in the zero-shear inhomogeneous Friedmann model.
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