Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-12
Astrophys.J.671:45-52, 2007
Astronomy and Astrophysics
Astrophysics
12 pages, 7 figures, references added, minor changes, accepted for publication in ApJ
Scientific paper
10.1086/522564
We study weak gravitational lensing of galaxy clusters in terms of the MOND (MOdified Newtonian Dynamics) theory. We calculate shears and convergences of background galaxies for three clusters (A1689, CL0024+1654, CL1358+6245) and the mean profile of 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 angular radius, 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 $g_0$ and for three interpolation functions. If the dark halo is composed of massive neutrinos, its mass should be heavier than 2 eV. However the constraint still depends on the dark halo model and there are systematic uncertainties, and hence the more careful study is necessary to put a stringent constraint.
Chiba Takeshi
Takahashi Ryuichi
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