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| A Remark on Using Gravitational Lensing Probability as a Probe of the Central Regions of CDM Halos | |
| 引用本文： | YunLiNational Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012. A Remark on Using Gravitational Lensing Probability as a Probe of the Central Regions of CDM Halos[J]. 中国天文和天体物理学报, 2002, 2(5): 399-407 |
| 作者姓名： | YunLiNational Astronomical Observatories Chinese Academy of Sciences Beijing 100012 |
| 作者单位： | YunLiNational Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 |
| 基金项目： | This work was partially supported by the National Natural Science Foundation of China under Grant No. 10003002. |
| 摘 要： | We calculate the gravitational lensing probabilities by cold dark matter (CDM) halos with different density profiles, and compare them with current observations from the Cosmic Lens All-Sky Survey (CLASS) and the Jodrell-Bank VLA Astrometric Survey (JVAS). We find that the lensing probability is dramatically sensitive to the clumping of the dark matter, or quantitatively, the concentration parameter. We also find that our predicted lensing probabilities in most cases show inconsistency with the observations. It is argued that high lensing probability may not be an effective tool for probing the statistical properties of inner structures of dark matter halos. |
| 关 键 词： | 宇宙学 暗物质 光晕 数值模拟 CDM |
A Remark on Using Gravitational Lensing Probability as a Probe of the Central Regions of CDM Halos |
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| Yun Li. A Remark on Using Gravitational Lensing Probability as a Probe of the Central Regions of CDM Halos[J]. Chinese Journal of Astronomy and Astrophysics, 2002, 2(5): 399-407 | |
| Authors: | Yun Li |
| Affiliation: | NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012 |
| Abstract: | We calculate the gravitational lensing probabilities by cold dark matter (CDM) halos with different density profiles,and compare them with current observations from the Cosmic Lens All-Sky Survery(CLASS) and the Jodrell-Bank VLA Astrometric Survey(JVAS).We find that the lensing probability is dramatically sensitive to the clumping of the dark matter,or quantitatively,the concentration parameter,We also find that our predicted lensing probabilities in most cases show inconsistency with the observations.It is argued that high lensing probability may not be an effective tool for probing the statistical properties of inner structures of dark matter halos. |
| Keywords: | cosmology: dark matter - gravitational lensing - cosmology:theory - galaxies: halos |
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