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题名: Magnification cross-sections of gravitational lensing by galaxies in general FLRW cosmologies
作者: Zhu, ZH
刊名: ASTRONOMY AND ASTROPHYSICS
出版日期: 1998
卷号: 338, 期号:3, 页码:777-780
关键词: LUMINOSITY FUNCTION ;  REDSHIFT SURVEY ;  FAINT GALAXIES ;  CONSTANT ;  DENSITY ;  LIMITS
学科分类: Physics
通讯作者: Zhu, ZH , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Beijing Astrophys Ctr, Beijing 100871, Peoples R China
英文摘要: For a wide variety of cosmological models characterized by the cosmic mass density Omega(M) and the normalized cosmological constant Omega(Lambda), we derive an analytic expression for the estimate of magnification cross-sections by an ensemble of isothermal spheres as models of galactic mass distributions. This provides a simple approach to demonstrate how the lensing probability by galaxies depends on the cosmological parameters. An immediate consequence is that, while a non-zero cosmological constant indeed leads to a significant increase of the lensing probability as it has been shown in the literature, only a small fraction of sky to z similar to 3 can be moderately (mu similar to 1.3) lensed by galaxies even in a Lambda-dominated flat universe. Therefore, whether or not there is a nonzero cosmological constant, it is unlikely that the overall quasar counts have been seriously contaminated by the presence of galactic lenses.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000076735400010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12248
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Zhu, ZH. Magnification cross-sections of gravitational lensing by galaxies in general FLRW cosmologies[J]. ASTRONOMY AND ASTROPHYSICS,1998,338(3):777-780.
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