Статья

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

Masamune OguriDepartment of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, JapanNaohisa InadaInstitute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, JapanJoseph F. HennawiDepartment of Astronomy, University of California at Berkeley, 601 Campbell Hall, Berkeley, CA 94720-3411Gordon T. RichardsPrinceton University Observatory, Peyton Hall, Princeton, NJ 08544David E. JohnstonPrinceton University Observatory, Peyton Hall, Princeton, NJ 08544Joshua A. FriemanAstronomy and Astrophysics Department, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637B. PindorCanadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, CanadaMichael A. StraussPrinceton University Observatory, Peyton Hall, Princeton, NJ 08544Robert J. BrunnerDepartment of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801R. H. BeckerDepartment of Physics, University of California at Davis, 1 Shields Avenue, Davis, CA 95616F. J. CastanderInstitut d’Estudis Espacials de Catalunya/CSIC, Gran Capita 2-4, 08034 Barcelona, SpainMichael D. GreggDepartment of Physics, University of California at Davis, 1 Shields Avenue, Davis, CA 95616Patrick B. HallDepartment of Physics and Astronomy, York University, 4700 Keele Street, Toronto, ON M3J 1P3, CanadaHans-Walter RixMax-Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, GermanyDonald P. SchneiderDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802Neta A. BahcallPrinceton University Observatory, Peyton Hall, Princeton, NJ 08544J. BrinkmannDonald G. YorkAstronomy and Astrophysics Department, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637

2005en

ABI

Аннотация

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 Lambda-dominated cosmology and observed velocity function of galaxies.

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Идентификаторы

DOI: 10.1086/428087

Цитирования и источники

Цитирований: 3Использованных источников: 0

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