Gravitational lensing properties of an isothermal universal halo profile
Er Xinzhong
Source PublicationResearch in Astronomy and Astrophysics
AbstractN-body simulations predict that dark matter halos with different mass scales are described by a universal model, the Navarro-Frenk-White (NFW) density profiles. As a consequence of baryonic cooling effects, these halos will become more concentrated, and similar to an isothermal sphere over a large range in radii (similar to 300 h(-1) kpc). The singular isothermal sphere (SIS) model however has to be truncated artificially at large radii since it extends to infinity. We model a massive galaxy halo as a combination of an isothermal sphere and an NFW density profile. We give an approximation for the mass concentration at different baryon fractions and present exact expressions for the weak lensing shear and flexion for such a halo. We compare the lensing properties with the SIS and NFW profiles. We find that the combined profile can generate higher order lensing signals at small radii and is more efficient in generating strong lensing events. In order to distinguish such a halo profile from the SIS or NEW profiles, one needs to combine strong and weak lensing constraints for small and large radii.
Funding Project[National Natural Science Foundation of China]
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Er Xinzhong. Gravitational lensing properties of an isothermal universal halo profile[J]. Research in Astronomy and Astrophysics,2013,13(5):517.
APA Er Xinzhong.(2013).Gravitational lensing properties of an isothermal universal halo profile.Research in Astronomy and Astrophysics,13(5),517.
MLA Er Xinzhong."Gravitational lensing properties of an isothermal universal halo profile".Research in Astronomy and Astrophysics 13.5(2013):517.
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