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

Masamune Oguri, Naohisa Inada, Joseph F. Hennawi, Gordon T. Richards, David E. Johnston, Joshua A. Frieman, Bartosz Pindor, Michael Abram Strauss, Robert J. Brunner, Robert H. Becker, Francisco J. Castander, Michael D. Gregg, Patrick B. Hall, Hans Walter Rix, Donald P. Schneider, Neta Bahcall, Jonathan Brinkmann, Donald G. York

Research output: Contribution to journalArticle

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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

Cite this

Oguri, M., Inada, N., Hennawi, J. F., Richards, G. T., Johnston, D. E., Frieman, J. A., ... York, D. G. (2005). Discovery of two gravitationally lensed quasars with image separations of 3″ from the sloan digital sky survey. Astrophysical Journal, 622(1 I), 106-115. https://doi.org/10.1086/428087
Oguri, Masamune ; Inada, Naohisa ; Hennawi, Joseph F. ; Richards, Gordon T. ; Johnston, David E. ; Frieman, Joshua A. ; Pindor, Bartosz ; Strauss, Michael Abram ; Brunner, Robert J. ; Becker, Robert H. ; Castander, Francisco J. ; Gregg, Michael D. ; Hall, Patrick B. ; Rix, Hans Walter ; Schneider, Donald P. ; Bahcall, Neta ; Brinkmann, Jonathan ; York, Donald G. / Discovery of two gravitationally lensed quasars with image separations of 3″ from the sloan digital sky survey. In: Astrophysical Journal. 2005 ; Vol. 622, No. 1 I. pp. 106-115.
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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.",
author = "Masamune Oguri and Naohisa Inada and Hennawi, {Joseph F.} and Richards, {Gordon T.} and Johnston, {David E.} and Frieman, {Joshua A.} and Bartosz Pindor and Strauss, {Michael Abram} and Brunner, {Robert J.} and Becker, {Robert H.} and Castander, {Francisco J.} and Gregg, {Michael D.} and Hall, {Patrick B.} and Rix, {Hans Walter} and Schneider, {Donald P.} and Neta Bahcall and Jonathan Brinkmann and York, {Donald G.}",
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Oguri, M, Inada, N, Hennawi, JF, Richards, GT, Johnston, DE, Frieman, JA, Pindor, B, Strauss, MA, Brunner, RJ, Becker, RH, Castander, FJ, Gregg, MD, Hall, PB, Rix, HW, Schneider, DP, Bahcall, N, Brinkmann, J & York, DG 2005, 'Discovery of two gravitationally lensed quasars with image separations of 3″ from the sloan digital sky survey', Astrophysical Journal, vol. 622, no. 1 I, pp. 106-115. https://doi.org/10.1086/428087

Discovery of two gravitationally lensed quasars with image separations of 3″ from the sloan digital sky survey. / Oguri, Masamune; Inada, Naohisa; Hennawi, Joseph F.; Richards, Gordon T.; Johnston, David E.; Frieman, Joshua A.; Pindor, Bartosz; Strauss, Michael Abram; Brunner, Robert J.; Becker, Robert H.; Castander, Francisco J.; Gregg, Michael D.; Hall, Patrick B.; Rix, Hans Walter; Schneider, Donald P.; Bahcall, Neta; Brinkmann, Jonathan; York, Donald G.

In: Astrophysical Journal, Vol. 622, No. 1 I, 20.03.2005, p. 106-115.

Research output: Contribution to journalArticle

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

AU - Oguri, Masamune

AU - Inada, Naohisa

AU - Hennawi, Joseph F.

AU - Richards, Gordon T.

AU - Johnston, David E.

AU - Frieman, Joshua A.

AU - Pindor, Bartosz

AU - Strauss, Michael Abram

AU - Brunner, Robert J.

AU - Becker, Robert H.

AU - Castander, Francisco J.

AU - Gregg, Michael D.

AU - Hall, Patrick B.

AU - Rix, Hans Walter

AU - Schneider, Donald P.

AU - Bahcall, Neta

AU - Brinkmann, Jonathan

AU - York, Donald G.

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.

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