On gravitational lenses and the cosmological evolution of quasars

Details On gravitational lenses and the cosmological evolution of quasars On gravitational lenses and the cosmological evolution of quasars

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248l..95a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 248, Sept. 15, 1981, p. L95-L99.

Mathematics

Logic

29

Astronomical Models, Cosmology, Galactic Evolution, Gravitational Lenses, Quasars, Heuristic Methods, Luminous Intensity

Scientific paper

A heuristic model for the effect of gravitational lenses on the apparent cosmological evolution of quasars is considered. The model satisfies the requirement of average flux conservation and has no net mean amplification. This requirement is shown to be numerically important in studying the effect. On the basis of the values of the evolution indicators calculated from the model, it is concluded that it is premature to assert that lensing plays an important role in affecting the apparent evolution. A qualitative, model independent observational test for the effect is suggested. The test estimates the distances where lensing is dominant. An application of this test to a complete sample of quasars indicates that lensing cannot completely account for the apparent evolution, except in an extreme situation.

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