SIMBAD references

2006AJ....131...49R - Astron. J., 131, 49-54 (2006/January-0)

A snapshot survey for gravitational lenses among z ≥ 4.0 quasars. II. Constraints on the 4.0<z<5.4 quasar population.

RICHARDS G.T., HAIMAN Z., PINDOR B., STRAUSS M.A., FAN X., EISENSTEIN D., SCHNEIDER D.P., BAHCALL N.A., BRINKMANN J. and FUKUGITA M.

Abstract (from CDS):

We report on i-band snapshot observations of 157 Sloan Digital Sky Survey quasars at 4.0<z<5.4 using the Advanced Camera for Surveys on the Hubble Space Telescope (HST) to search for evidence of gravitational lensing of these sources. None of the quasars appear to be strongly lensed and multiply imaged at the angular resolution (∼0".1) and sensitivity of HST. The nondetection of strong lensing in these systems constrains the z=4-5 luminosity function to an intrinsic slope of β>-3.8 (3 σ), assuming a break in the quasar luminosity function at M*1450~-24.5. This constraint is considerably stronger than the limit of β>-4.63 obtained from the absence of lensing in four z>5.7 quasars. Such constraints are important to our understanding of the true space density of high-redshift quasars and the ionization state of the early universe.

Abstract Copyright:

Journal keyword(s): Cosmology: Early Universe - Galaxies: Luminosity Function, Mass Function - Gravitational Lensing - Galaxies: Quasars: General

VizieR on-line data: <Available at CDS (J/AJ/131/49): table1.dat table2.dat>

CDS comments: Erratum vol.132, p.967 (2006)

Simbad objects: 246

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2006AJ....131...49R and select 'bookmark this link' or equivalent in the popup menu


2022.10.03-12:31:41

© Université de Strasbourg/CNRS

    • Contact