Time Delay of Light in the Gravitational lensing of Supermassive Black Holes in Dark Matter Halos
arXiv:2403.05682 · doi:10.1140/epjc/s10052-024-13403-3
Abstract
The dark matter halo has non-negligible effects on the gravitational lensing of supermassive black hole in the galaxy center. Our work presents a study on the time-delay of light in gravitational lensing of black holes enclosed by dark matter halos. To provide a precise description on the distribution of dark matter in galaxies, we choose several famous phenomenological dark matter halo models in astrophysics, including the NFW, Beta, Burkert and Moore models, to carry out the present study. Through numerically calculating the time-delay of light in gravitational lensing, a comparative analysis of the dark matter effects within different halo models has been performed. Assuming typical length scales associated with the galactic gravitational lensing, numerical results indicate that the NFW, Beta, Burkert and Moore dark matter halos can significantly enhance the time delay of light in gravitational lenisng of central supermassive black holes. The enhancing effect becomes more pronounced with a small dark matter halo scale and an increasing dark matter halo mass. Keywords: Black Hole; Gravitational Lensing; Time Delay; Dark Matter Halo
arXiv comment22 pages, 7 figures, 2 Appendices V2: some errors are corrected; V3: major revision, two appendices added
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