Quasar Lensing Caused by Clusters of Galaxies in Various Cosmological Models
[摘要] About33%oftheobservedlensedquasarshaveseparationangleslargerthan3″.Totheoreticallyreproducethisobservationalfact,weinvestigatethestatisticsofquasarlensingduetoclustersofgalaxies,invariouscosmologicalmodelsincludingasuper-horizon-scaleinhomogeneousmodel.BycalculatingtheexpectednumberoflensedquasarsandcomparingitwiththeobservednumberintheHubbleSpaceTelescopesnapshotsurvey,itisfoundthatareasonablenumberoflensedquasarswithsuchlargeseparationanglescanbeobtainedinthecosmological-constant-dominantlow-densitymodelsandthesuper-horizonscaleinhomogeneousmodelswithalow-densityinnerregion.Fromthestandpointoflensstatisticsduetoclustersofgalaxies,itisconcludedthatthesecosmologicalmodelsarebetter,incontrasttothepreviousresultsinthegalacticlensmodels.
[发布日期] [发布机构]
[效力级别] [学科分类] 天文学(综合)
[关键词] Cosmology;"Galaxies: clusters of";"Gravitational lenses";Quasars [时效性]
