Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..697g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Aug. 1985, p. 697-699.
Astronomy and Astrophysics
Astronomy
1
Big Bang Cosmology, Galactic Structure, Relativity, Angular Velocity, Astronomical Models, Diameters, Doppler Effect, Mass Distribution, Red Shift
Scientific paper
A new explanation is offered for the increase in angular diameter of redshifted galaxies above that given by the inverse distance relationship. (A physical explanation is frequently given in terms of the curvature of space, but the increase due to this curvature factor is much less). The increase proportional to (1+z) and the quantity cz are global observables of an expanding universe which, in the limit of small z, correspond to the local observables of the relative change in angle due to the aberration of light and to the Doppler velocity, respectively. Neglect of the increase in angular diameter and of the increase in redshift velocity difference of binary galaxies leads to an overestimate of their masses by the factor (1+z)-to-the-4th.
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