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 A. Strauss; Robert J. Brunner; Robert H. Becker; Francisco J. Castander; Michael D. Gregg; Patrick B. Hall; Hans Walter Rix; Donald P. Schneider; Neta A. Bahcall; Jonathan Brinkmann; Donald G. York

doi:10.1086/428087

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 A. Strauss, Robert J. Brunner, Robert H. Becker, Francisco J. Castander, Michael D. Gregg, Patrick B. Hall, Hans Walter Rix, Donald P. Schneider, Neta A. Bahcall, Jonathan Brinkmann, Donald G. York

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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 language	English (US)
Pages (from-to)	106-115
Number of pages	10
Journal	Astrophysical Journal
Volume	622
Issue number	1 I
DOIs	https://doi.org/10.1086/428087
State	Published - Mar 20 2005

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Cosmology: observations
Cosmology: theory
Gravitational lensing

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10.1086/428087

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Oguri, M., Inada, N., Hennawi, J. F., Richards, G. T., Johnston, D. E., Frieman, J. A., Pindor, B., Strauss, M. A., Brunner, R. J., Becker, R. H., Castander, F. J., Gregg, M. D., Hall, P. B., Rix, H. W., Schneider, D. P., Bahcall, N. A., Brinkmann, J., & 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

@article{5c0b027524744c2fa828181f04273f36,

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 = "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 A.} 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 Bahcall, {Neta A.} and Jonathan Brinkmann and York, {Donald G.}",

year = "2005",

month = mar,

day = "20",

doi = "10.1086/428087",

language = "English (US)",

volume = "622",

pages = "106--115",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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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, NA, 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

TY - JOUR

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 A.

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 A.

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.

KW - Cosmology: observations

KW - Cosmology: theory

KW - Gravitational lensing

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U2 - 10.1086/428087

DO - 10.1086/428087

M3 - Article

AN - SCOPUS:20844452376

SN - 0004-637X

VL - 622

SP - 106

EP - 115

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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