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Nonsingular density profiles of dark matter halos and strong gravitational lensing
Chen, DM
AbstractWe use the statistics of strong gravitational lenses to investigate whether mass profiles with a flat density core are supported. The probability for lensing by halos modeled by a nonsingular truncated isothermal sphere (NTIS) with image separations greater than a certain value (ranging from 0 '' to 10 '') is calculated. NTIS is an analytical model for the postcollapse equilibrium structure of virialized objects derived by Shapiro, Iliev, & Raga. This profile has a soft core and matches quite well with the mass profiles of dark matter-dominated dwarf galaxies deduced from their observed rotation curves. It also agrees well with the NFW (Navarro-Frenk-White) profile at all radii outside of a few NTIS core radii. Unfortunately, comparing the results with those for singular lensing halos (NFW and SIS + NFW) and strong lensing observations, the probabilities for lensing by NTIS halos are far too low. As this result is valid for any other nonsingular density profile (with a large core radius), we conclude that nonsingular density profiles (with a large core radius) for CDM halos are ruled out by statistics of strong gravitational lenses.
KeywordCosmology : Theory Dark Matter Galaxies : Halos Gravitational Lensing
Indexed BySCI
WOS IDWOS:000230999600003
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
AffiliationChinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Chen, DM. Nonsingular density profiles of dark matter halos and strong gravitational lensing[J]. ASTROPHYSICAL JOURNAL,2005,629(1):23-28.
APA Chen, DM.(2005).Nonsingular density profiles of dark matter halos and strong gravitational lensing.ASTROPHYSICAL JOURNAL,629(1),23-28.
MLA Chen, DM."Nonsingular density profiles of dark matter halos and strong gravitational lensing".ASTROPHYSICAL JOURNAL 629.1(2005):23-28.
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