Discovery of Two Gravitationally Lensed Quasars with Image Separations of 3″ from the Sloan Digital Sky Survey | Zendy

Masamune Oguri | Zendy; Naohisa Inada | Zendy; Joseph F. Hennawi | Zendy; Gordon T. Richards | Zendy; David E. Johnston | Zendy; Joshua A. Frieman | Zendy; B. Pindor | Zendy; Michael A. Strauss | Zendy; Robert J. Brunner | Zendy; R. H. Becker | Zendy; F. J. Castander | Zendy; Michael D. Gregg | Zendy; Patrick B. Hall | Zendy; HansWalter Rix | Zendy; Donald P. Schneider | Zendy; Neta A. Bahcall | Zendy; J. Brinkmann | Zendy; Donald G. York | Zendy

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Discovery of Two Gravitationally Lensed Quasars with Image Separations of 3″ from the Sloan Digital Sky Survey

Author(s) -

Masamune Oguri,

Naohisa Inada,

Joseph F. Hennawi,

Gordon T. Richards,

David E. Johnston,

Joshua A. Frieman,

B. Pindor,

Michael A. Strauss,

Robert J. Brunner,

R. H. Becker,

F. J. Castander,

Michael D. Gregg,

Patrick B. Hall,

HansWalter Rix,

Donald P. Schneider,

Neta A. Bahcall,

J. Brinkmann,

Donald G. York

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/428087

Subject(s) - quasar , physics , astrophysics , galaxy , sky , redshift , lens (geology) , gravitational lens , cosmology , astronomy , optics

We report the discovery of two doubly-imaged quasars, SDSSJ100128.61+502756.9 and SDSS J120629.65+433217.6, at redshifts of 1.838 and1.789 and with image separations of 2.86'' and 2.90'', respectively. Theobjects 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 eachpair and the identification of the lens galaxies, we conclude that the objectsare gravitational lenses. The lenses are complicated; in both systems there areseveral galaxies in the fields very close to the quasars, in addition to thelens galaxies themselves. The lens modeling implies that these nearby galaxiescontribute significantly to the lens potentials. On larger scales, we havedetected 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 exceedsthe prediction of simple theoretical models based on the standardLambda-dominated cosmology and observed velocity function of galaxies.Comment: 24 pages, 9 figures, accepted for publication in Ap

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