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Magnification cross-sections of gravitational lensing by galaxies in general FLRW cosmologies
Zhu, ZH; Zhu, ZH , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
1998
发表期刊ASTRONOMY AND ASTROPHYSICS
ISSN0004-6361
卷号338期号:3页码:777-780
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.
部门归属Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Beijing Astrophys Ctr, Beijing 100871, Peoples R China
关键词Luminosity Function Redshift Survey Faint Galaxies Constant Density Limits
学科领域Physics
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收录类别SCI
WOS记录号WOS:000076735400010
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被引频次:20[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12248
专题理论物理所SCI论文
通讯作者Zhu, ZH , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
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Zhu, ZH,Zhu, ZH , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.. Magnification cross-sections of gravitational lensing by galaxies in general FLRW cosmologies[J]. ASTRONOMY AND ASTROPHYSICS,1998,338(3):777-780.
APA Zhu, ZH,&Zhu, ZH , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China..(1998).Magnification cross-sections of gravitational lensing by galaxies in general FLRW cosmologies.ASTRONOMY AND ASTROPHYSICS,338(3),777-780.
MLA Zhu, ZH,et al."Magnification cross-sections of gravitational lensing by galaxies in general FLRW cosmologies".ASTRONOMY AND ASTROPHYSICS 338.3(1998):777-780.
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