Do the lensing cross-sections of faint galaxies cover the whole sky?

	Do the lensing cross-sections of faint galaxies cover the whole sky?
	Zhu, ZH; Wu, XP
刊名	ASTRONOMY & ASTROPHYSICS
	1997-10-01
卷号	326 期号:1 页码:L9-L11
关键词	gravitational lensing galaxies: general
英文摘要	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.
收录类别	SCI
语种	英语
WOS记录号	WOS:A1997XZ84900003
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8321]
专题	国家天文台_星系宇宙学研究部
作者单位	CHINESE ACAD SCI, BEIJING ASTRON OBSERV, BEIJING 100080, PEOPLES R CHINA
推荐引用方式 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.