Discovery of two gravitationally lensed quasars with image separations of 3″ from the sloan digital sky survey

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Abstract

We report the discovery of two doubly imaged quasars, SDSS J100128.61+502756.9 and SDSS J120629.65+ 433217.6, at redshifts of 1.838 and 1.789, and with image separations of 2″.86 and 2″.90, respectively. The objects were selected as lens candidates from the Sloan Digital Sky Survey (SDSS). Based on the identical nature of the spectra of the two quasars in each pair and the identification of the lens galaxies, we conclude that the objects are gravitational lenses. The lenses are complicated; in both systems there are several galaxies in the fields very close to the quasars, in addition to the lens galaxies themselves. The lens modeling implies that these nearby galaxies contribute significantly to the lens potentials. On larger scales, we have detected an enhancement in the galaxy density near SDSS J100128.61+502756.9. The number of lenses with image separation of ∼3″ in the SDSS already exceeds the prediction of simple theoretical models based on the standard Λ-dominated cosmology and observed velocity function of galaxies.

Original languageEnglish (US)
Pages (from-to)106-115
Number of pages10
JournalAstrophysical Journal
Volume622
Issue number1 I
DOIs
StatePublished - Mar 20 2005

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quasars
lenses
galaxies
cosmology
gravitational lenses
prediction
modeling
augmentation
predictions

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmology: observations
  • Cosmology: theory
  • Gravitational lensing

Cite this

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title = "Discovery of two gravitationally lensed quasars with image separations of 3″ from the sloan digital sky survey",
abstract = "We report the discovery of two doubly imaged quasars, SDSS J100128.61+502756.9 and SDSS J120629.65+ 433217.6, at redshifts of 1.838 and 1.789, and with image separations of 2″.86 and 2″.90, respectively. The objects were selected as lens candidates from the Sloan Digital Sky Survey (SDSS). Based on the identical nature of the spectra of the two quasars in each pair and the identification of the lens galaxies, we conclude that the objects are gravitational lenses. The lenses are complicated; in both systems there are several galaxies in the fields very close to the quasars, in addition to the lens galaxies themselves. The lens modeling implies that these nearby galaxies contribute significantly to the lens potentials. On larger scales, we have detected an enhancement in the galaxy density near SDSS J100128.61+502756.9. The number of lenses with image separation of ∼3″ in the SDSS already exceeds the prediction of simple theoretical models based on the standard Λ-dominated cosmology and observed velocity function of galaxies.",
keywords = "Cosmology: observations, Cosmology: theory, Gravitational lensing",
author = "Strauss, {Michael A.} and Bahcall, {Neta A.}",
year = "2005",
month = "3",
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pages = "106--115",
journal = "Astrophysical Journal",
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number = "1 I",

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TY - JOUR

T1 - Discovery of two gravitationally lensed quasars with image separations of 3″ from the sloan digital sky survey

AU - Strauss, Michael A.

AU - Bahcall, Neta A.

PY - 2005/3/20

Y1 - 2005/3/20

N2 - We report the discovery of two doubly imaged quasars, SDSS J100128.61+502756.9 and SDSS J120629.65+ 433217.6, at redshifts of 1.838 and 1.789, and with image separations of 2″.86 and 2″.90, respectively. The objects were selected as lens candidates from the Sloan Digital Sky Survey (SDSS). Based on the identical nature of the spectra of the two quasars in each pair and the identification of the lens galaxies, we conclude that the objects are gravitational lenses. The lenses are complicated; in both systems there are several galaxies in the fields very close to the quasars, in addition to the lens galaxies themselves. The lens modeling implies that these nearby galaxies contribute significantly to the lens potentials. On larger scales, we have detected an enhancement in the galaxy density near SDSS J100128.61+502756.9. The number of lenses with image separation of ∼3″ in the SDSS already exceeds the prediction of simple theoretical models based on the standard Λ-dominated cosmology and observed velocity function of galaxies.

AB - We report the discovery of two doubly imaged quasars, SDSS J100128.61+502756.9 and SDSS J120629.65+ 433217.6, at redshifts of 1.838 and 1.789, and with image separations of 2″.86 and 2″.90, respectively. The objects were selected as lens candidates from the Sloan Digital Sky Survey (SDSS). Based on the identical nature of the spectra of the two quasars in each pair and the identification of the lens galaxies, we conclude that the objects are gravitational lenses. The lenses are complicated; in both systems there are several galaxies in the fields very close to the quasars, in addition to the lens galaxies themselves. The lens modeling implies that these nearby galaxies contribute significantly to the lens potentials. On larger scales, we have detected an enhancement in the galaxy density near SDSS J100128.61+502756.9. The number of lenses with image separation of ∼3″ in the SDSS already exceeds the prediction of simple theoretical models based on the standard Λ-dominated cosmology and observed velocity function of galaxies.

KW - Cosmology: observations

KW - Cosmology: theory

KW - Gravitational lensing

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U2 - https://doi.org/10.1086/428087

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JF - Astrophysical Journal

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