Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242l.135t&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 242, Dec. 15, 1980, p. L135-L139.
Astronomy and Astrophysics
Astrophysics
130
Cosmology, Gravitational Lenses, Luminous Intensity, Quasars, Brightness Temperature, Mathematical Models, Space Density, Statistical Analysis
Scientific paper
Brightness amplifications by undetected gravitational lenses could be responsible in part for the apparent evolution of quasars, particularly for those which appear to be of high luminosity. It is shown that values of the evolution parameter greater than or equal to 0.6 and number-magnitude slopes greater than or equal to 0.9 need not necessarily imply source density evolution if lensing events are common. Quasar samples which are defined by flux limits and minimum luminosities will preferentially include gravitational lens systems. Even if lensing events are quite rare, a large fraction of the lensed quasars will appear more luminous than the most luminous unlensed quasar.
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