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Do the lensing cross-sections of faint galaxies cover the whole sky?
Zhu, ZH; Wu, XP
1997-10-01
发表期刊ASTRONOMY & ASTROPHYSICS
卷号326期号:1页码:L9-L11
摘要Very deep galaxy surveys have revealed a considerably large population of faint galaxies, which leads to the speculation that all distant objects are moderately magnified by the gravitational lensing effects of galaxies (Fried 1997). In this letter, we present a simple estimate of the lensing amplitudes by all galaxies up to redshift z = 2 in terms of galaxy merging and answer the question whether the sky is fully covered by the lensing cross-sections of galaxies. It is shown that, as a result of the combination of the increase of galaxy number and the decrease of galaxy velocity dispersion with lookback time, less than similar to 1/10 of the sky to z = 2 can be moderately affected by the galaxy acting as lenses with magnification mu > 1.1. This conclusion is independent of the galaxy limiting magnitude. In other Words, no matter how high the surface number density of faint galaxies becomes, it is unlikely that their lensing cross-sections of mu > 1.1 can cover the whole sky.
关键词Gravitational Lensing Galaxies: General
收录类别SCI
语种英语
WOS记录号WOS:A1997XZ84900003
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8321
专题星系宇宙学研究部
作者单位CHINESE ACAD SCI, BEIJING ASTRON OBSERV, BEIJING 100080, PEOPLES R CHINA
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Zhu, ZH,Wu, XP. Do the lensing cross-sections of faint galaxies cover the whole sky?[J]. ASTRONOMY & ASTROPHYSICS,1997,326(1):L9-L11.
APA Zhu, ZH,&Wu, XP.(1997).Do the lensing cross-sections of faint galaxies cover the whole sky?.ASTRONOMY & ASTROPHYSICS,326(1),L9-L11.
MLA Zhu, ZH,et al."Do the lensing cross-sections of faint galaxies cover the whole sky?".ASTRONOMY & ASTROPHYSICS 326.1(1997):L9-L11.
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