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题名: Sample incompleteness in the study of the quasar-galaxy associations as a result of gravitational lensing
作者: Zhu, ZH ;  Wu, XP
刊名: INTERNATIONAL JOURNAL OF MODERN PHYSICS D
出版日期: 1998
卷号: 7, 期号:3, 页码:463-469
关键词: QSOS ;  REDSHIFTS ;  ENVIRONMENTS
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; Chinese Acad Sci, Beijing Astron Observ, Beijing 100012, Peoples R China
英文摘要: For decades, the angular associations between faint galaxies and high redshift quasars have remained to be a well-known puzzle, which is often cited as an evidence for the noncosmological origin of quasar redshifts. This happens because the attempt at interpreting the phenomenon as being due to gravitational lensing fails in producing the reported high amplitude of the quasar-galaxy associations unless some unconventional hypotheses are made such as an extremely large velocity dispersion for galaxies, a serious contamination of the overall quasar number counts or a strong matter clustering on galaxy scale. While there are good reasons to believe that the magnification bias should be a natural cause for the quasar-galaxy associations, we re-address the question by taking into account an important factor that has been overlooked in previous studies: The expected amplitude of the association in the framework of gravitational lensing depends sensitively on the quasar limiting magnitude, whereas none of the quasar samples in the measurements is actually complete. Taking this correction into account our predictions of the galaxy enhancement factors based on a simple lensing model are essentially consistent with observations, thus providing a helpful clue to eventually resolving the longstanding puzzle in astrophysics.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000074537000007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12304
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,Wu, XP. Sample incompleteness in the study of the quasar-galaxy associations as a result of gravitational lensing[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS D,1998,7(3):463-469.
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