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Do the lensing cross-sections of faint galaxies cover the whole sky?
Zhu, ZH; Wu, XP
1997-10-01
Source PublicationASTRONOMY & ASTROPHYSICS
Volume326Issue:1Pages:L9-L11
AbstractVery 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.
KeywordGravitational Lensing Galaxies: General
Indexed BySCI
Language英语
WOS IDWOS:A1997XZ84900003
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8321
Collection星系宇宙学研究部
AffiliationCHINESE ACAD SCI, BEIJING ASTRON OBSERV, BEIJING 100080, PEOPLES R CHINA
Recommended Citation
GB/T 7714
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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