SIMBAD references

2001MNRAS.326L..45S - Mon. Not. R. Astron. Soc., 326, L45-L49 (2001/October-1)

First results from the Isaac Newton Telescope Wide Angle Survey: the z > 5 quasar survey.


Abstract (from CDS):

We report the first results of an observational programme designed to determine the luminosity density of high-redshift quasars (z > 5 quasars) using deep multicolour CCD data. We report the discovery and spectra of three i < 21.5 high-redshift (z > 4.4) quasars, including one with (z > 5). At z = 5.17, this is the fourth highest redshift quasar currently published. Using these preliminary results we derive an estimate of the MB < -25.0 (MAB1450 < -24.5) quasar space density in the redshift range 4.8 < z < 5.8 of 3.6 ± 2.5 10–8 Mpc–3. When completed, the survey will provide a firm constraint on the contribution to the ionizing UV background in the redshift range 4.5 - 5.5 from quasars by determining the faint-end slope of the quasar luminosity function. The survey uses imaging data taken with the 2.5-m Isaac Newton Telescope as part of the Public Isaac Newton Group Wide Field Survey (WFS). This initial sample of objects is taken from two fields of effective area ∼12.5deg2 from the final ∼100deg2.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): galaxies: active - quasars: general

Nomenclature: Tables 1, 2: [SHM2001] WFS JHHMM.m+DDMM N=1 added.

Simbad objects: 13

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