A Snapshot Survey for Gravitational Lenses Among z>=4.0 Quasars: II. Constraints on the 4.0<z<4.5 Quasar Population

Details A Snapshot Survey for Gravitational Lenses Among z>=4.0 Quasars: II. Constraints on the 4.0<z<4.5 Quasar Population A Snapshot Survey for Gravitational Lenses Among z>=4.0 Quasars: II. Constraints on the 4.0<z<4.5 Quasar Population

2005-09-06

arxiv.org/abs/astro-ph/0509135v1

Astron.J.131:49-54,2006

Astronomy and Astrophysics

Astrophysics

19 pages (2 figures, 2 tables); AJ accepted; higher resolution version available at ftp://eta.pha.jhu.edu/pub/users/gtr/hstl

Scientific paper

10.1086/498063

We report on i-band snapshot observations of 157 Sloan Digital Sky Survey (SDSS) quasars at 4-3.8 (3 sigma), assuming a break in the quasar luminosity function at M_1450^star=-24.5. This constraint is considerably stronger than the limit of beta>-4.63 obtained from the absence of lensing in four z>5.7 quasars. Such constraints are important for our understanding of the true space density of high-redshift quasars and the ionization state of the early universe.

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