NAOC Open IR  > 星系宇宙学研究部
Constraints on the warm dark matter model from gravitational lensing
Xue, YJ; Wu, XP
AbstractFormation of subgalactic halos is suppressed in a warm dark matter (WDM) model due to thermal motion of WDM particles. This may provide a natural resolution to some puzzles in standard cold dark matter (CDM) theory such as the cusped density profiles of virialized dark halos and the overabundance of low-mass satellites. One of the observational tests of the WDM model is to measure the gravitationally lensed images of distant quasars below subarcsecond scales. In this Letter, we report a comparison of the lensing probabilities of multiple images between CDM and WDM models using a singular isothermal sphere model for the mass density profiles of dark halos and the Press-Schechter mass function for their distribution and cosmic evolution. It is shown that the differential probability of multiple images with small angular separations down to similar to 10 mas should allow one to set useful constraints on the WDM particle mass. We discuss briefly the feasibility and uncertainties of this method in future radio surveys (e.g., VLBI) for gravitational lensing.
KeywordCosmology : Theory Dark Matter Galaxies : Formation Gravitational Lensing
Indexed BySCI
WOS IDWOS:000167208700005
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Beijing Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Xue, YJ,Wu, XP. Constraints on the warm dark matter model from gravitational lensing[J]. ASTROPHYSICAL JOURNAL,2001,549(1):L21-L23.
APA Xue, YJ,&Wu, XP.(2001).Constraints on the warm dark matter model from gravitational lensing.ASTROPHYSICAL JOURNAL,549(1),L21-L23.
MLA Xue, YJ,et al."Constraints on the warm dark matter model from gravitational lensing".ASTROPHYSICAL JOURNAL 549.1(2001):L21-L23.
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