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Weak Lensing of Galaxy Clusters in MOND | | Ryuichi Takahashi
; Takeshi Chiba
; | | Date: |
12 Jan 2007 | | Abstract: | We study weak gravitational lensing of galaxy clusters in terms of the relativistic MOND (MOdified Newtonian Dynamics) theory proposed by Bekenstein (2004). We calculate shears and magnifications of background galaxies for three clusters (A1689, CL0024+1654, CL1358+6245) and 42 SDSS (Sloan Digital Sky Survey) clusters and compare them with observational data. The mass profile is modeled as a sum of X-ray gas, galaxies and dark halo. For the shear as a function of the angle from the lens center, MOND predicts a shallower slope than the data irrespective of the critical acceleration parameter $g_0$. The dark halo is necessary to explain the data for any $g_0$. If the dark halo is composed of massive neutrinos, its mass should be heavier than 2-3 eV. However, it is still difficult to explain a small core (100-300 kpc) determined by the lensing data in the neutrino halo model. | | Source: | arXiv, astro-ph/0701365 | | Services: | Forum | Review | PDF | Favorites | |
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