Properties of Wide-separation Lensed Quasars by Clusters of Galaxies in the SDSS

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dc.creatorLi, G. L.
dc.creatorMao, S.
dc.creatorJing, Y. P.
dc.creatorLin, W. P.
dc.creatorOguri, M.
dc.date2007-01-29
dc.date2007-06-29
dc.date.accessioned2026-07-07T11:00:45Z
dc.date.available2026-07-07T11:00:45Z
dc.descriptionWe 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 centre of clusters by (artificially) adding a brightest central galaxy (BCG) as a truncated isothermal sphere. We make predictions in two flat cosmological models: a LCDM model with a matter density $Ω_0=0.3$, and $σ_8=0.9$ (LCDM0), and a model favoured by the WMAP three-year data with $Ω_0=0.238$, and $σ_8=0.74$ (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$^2$) and spectroscopic (with an effective area 5000 deg$^2$) quasar samples respectively in the LCDM0 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 < 8% level. The predicted cluster lens redshift peaks around redshift 0.5, and 90% are between 0.3 and 1. 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.
dc.description12 pages, 10 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0701801
dc.identifierhttp://arxiv.org/abs/astro-ph/0701801
dc.identifierMon.Not.Roy.Astron.Soc.378:469-481,2007
dc.identifierdoi:10.1111/j.1365-2966.2007.11820.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187760
dc.subjectAstrophysics
dc.titleProperties of Wide-separation Lensed Quasars by Clusters of Galaxies in the SDSS
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