Properties of Wide-separation Lensed Quasars byClusters of Galaxies in the SDSS

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We use high-resolution N-body numerical simulations to study the number of predicted large-separation multiply-imaged systems produced by clusters of galaxies in the SDSS photometric and spectroscopic quasar samples. We incorporate the condensation of baryons at the center of clusters by (artificially) adding a brightest central galaxy (BCG) as a truncated isothermal sphere. We make predictions in two at cosmological models: a {Lambda}CDM model with a matter density {Omega}{sub m,0} = 0.3, and {sigma}{sub 8} 0.9 ({Lambda}CDM0), and a model favored by the WMAP three-year data with {Omega}{sub m,0} = 0.238, and {sigma}{sub 8} = 0.74 (WMAP3). We found that the ... continued below

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12 pages

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Li, G.L.; Mao, S.; Jing, Y.P.; Lin, W.P. & Oguri, M. February 3, 2007.

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We use high-resolution N-body numerical simulations to study the number of predicted large-separation multiply-imaged systems produced by clusters of galaxies in the SDSS photometric and spectroscopic quasar samples. We incorporate the condensation of baryons at the center of clusters by (artificially) adding a brightest central galaxy (BCG) as a truncated isothermal sphere. We make predictions in two at cosmological models: a {Lambda}CDM model with a matter density {Omega}{sub m,0} = 0.3, and {sigma}{sub 8} 0.9 ({Lambda}CDM0), and a model favored by the WMAP three-year data with {Omega}{sub m,0} = 0.238, and {sigma}{sub 8} = 0.74 (WMAP3). We found that the predicted multiply-imaged quasars with separation > 10 is about 6.2 and 2.6 for the SDSS photometric (with an effective area 8000 deg{sup 2}) and spectroscopic (with an effective area 5000 deg{sup 2}) quasar samples respectively in the {Lambda}CDM0 model; the predicted numbers of large-separation lensed quasars agree well with the observations. These numbers are reduced by a factor of 7 or more in the WMAP3 model, and are consistent with data at {approx}< 8% level. The predicted cluster lens redshift peaks around redshift 0.5, and 90% are between 0.3 and 1. The ratio of systems with at least four image systems (N{sub img} {ge} 4) and those with N{sub img} {ge} 2 is about 1/3.5 for both the {Lambda}CDM0 and WMAP3 models, and for both the photometric and spectroscopic quasar samples.We find that the BCG creates a central circular region, comparable to the Einstein ring of the BCG, where the central image disappears in the usual three-image and five-image configurations. If we include four image systems as an extreme case of five-image systems (with an infinitely demagnified central image), we find that 68% of the central images are fainter by a factor of 100 than the brightest image, and about 80% are within 1.5 of the BCG.

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12 pages

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  • Journal Name: Monthly Notices of the Royal Astronomical Society

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  • Report No.: SLAC-PUB-12330
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 898866
  • Archival Resource Key: ark:/67531/metadc886648

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  • February 3, 2007

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 6, 2016, 4:54 p.m.

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Li, G.L.; Mao, S.; Jing, Y.P.; Lin, W.P. & Oguri, M. Properties of Wide-separation Lensed Quasars byClusters of Galaxies in the SDSS, article, February 3, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc886648/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.