Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-03-08
Astrophys.J. 577 (2002) 57-68
Astronomy and Astrophysics
Astrophysics
27 pages, 10 figures. Expansion on the discussion in astro-ph/0203116. Replaced with version accepted for publication in ApJ
Scientific paper
10.1086/342181
We predict the effects of gravitational lensing on the color-selected flux-limited samples of z~4.3 and z>5.8 quasars, recently published by the Sloan Digital Sky Survey (SDSS). Our main findings are: (i) The lensing probability should be 1-2 orders of magnitude higher than for conventional surveys. The expected fraction of multiply-imaged quasars is highly sensitive to redshift and the uncertain slope of the bright end of the luminosity function, beta_h. For beta_h=2.58 (3.43) we find that at z~4.3 and i*<20.0 the fraction is ~4% (13%) while at z~6 and z*<20.2 the fraction is ~7% (30%). (ii) The distribution of magnifications is heavily skewed; sources having the redshift and luminosity of the SDSS z>5.8 quasars acquire median magnifications of med(mu_obs)~1.1-1.3 and mean magnifications of
Loeb Abraham
Wyithe Stuart
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