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

Gordon T. Richards, Zoltán Haiman, Bartosz Pindor, Michael A. Strauss, Xiaohui Fan, Daniel Eisenstein, Donald P. Schneider, Neta A. Bahcall, J. Brinkmann, Masataka Fukugita

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)49-54
Number of pages6
JournalAstronomical Journal
Volume131
Issue number1
DOIs
StatePublished - Jan 2006

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gravitational lenses
quasars
ionization
space density
universe
luminosity

Keywords

  • Early universe
  • Galaxies: luminosity function, mass function
  • Gravitational lensing
  • Quasars: general

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

A snapshot survey for gravitational lenses among z ≥ 4.0 quasars. II. Constraints on the 4.0 < z < 5.4 quasar population. / Richards, Gordon T.; Haiman, Zoltán; Pindor, Bartosz; Strauss, Michael A.; Fan, Xiaohui; Eisenstein, Daniel; Schneider, Donald P.; Bahcall, Neta A.; Brinkmann, J.; Fukugita, Masataka.

In: Astronomical Journal, Vol. 131, No. 1, 01.2006, p. 49-54.

Research output: Contribution to journalArticle

Richards, GT, Haiman, Z, Pindor, B, Strauss, MA, Fan, X, Eisenstein, D, Schneider, DP, Bahcall, NA, Brinkmann, J & Fukugita, M 2006, 'A snapshot survey for gravitational lenses among z ≥ 4.0 quasars. II. Constraints on the 4.0 < z < 5.4 quasar population', Astronomical Journal, vol. 131, no. 1, pp. 49-54. https://doi.org/10.1086/498063
Richards, Gordon T. ; Haiman, Zoltán ; Pindor, Bartosz ; Strauss, Michael A. ; Fan, Xiaohui ; Eisenstein, Daniel ; Schneider, Donald P. ; Bahcall, Neta A. ; Brinkmann, J. ; Fukugita, Masataka. / A snapshot survey for gravitational lenses among z ≥ 4.0 quasars. II. Constraints on the 4.0 < z < 5.4 quasar population. In: Astronomical Journal. 2006 ; Vol. 131, No. 1. pp. 49-54.
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