Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-02-20
Astronomy and Astrophysics
Astrophysics
11 pages, 21 Postscript figures, accepted for publication in A&A
Scientific paper
The evolution of optically selected quasars is usually supposed to be well described by a single constant parameter, either k_L or k_D, depending whether we refer to luminosity or density evolution. In this paper we present a study of the variations of the evolution parameters with redshift, for different cosmological models, in order to probe the differential evolution with redshift. Two different quasar samples have been analyzed, the AAT Boyle's et al. and the LBQS catalogues. Basically, these samples are divided in redshift intervals and in each of them k_L and k_D are estimated by forcing that
Hatziminaoglou Evanthia
Mathez Guy
Waerbeke Ludovic Van
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