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Due to observational constraints, dark matter determinations in nearbyclusters based on weak lensing are still extremely rare, in spite of theirimportance for the determination of cluster properties independent of othermethods. We present a weak lensing study of the Coma cluster (redshift 0.024)based on deep images obtained at the CFHT. After obtaining photometricredshifts for the galaxies in our field based on deep images in the u (1x1deg2), and in the B, V, R and I bands (42'x52'), allowing us to eliminateforeground galaxies, we apply weak lensing calculations on shape measurementsperformed in the u image. We derive a map of the mass distribution in Coma, aswell as the radial shear profile, and the mass and concentration parameter atvarious radii. We obtain M_200c = 5.1+4.3-2.1 x10^14 Msun andc_200c=5.0+3.2-2.5, in good agreement with previous measurements. With deepwide field images it is now possible to analyze nearby clusters with weaklensing techniques, thus opening a broad new field of investigation.

A weak lensing study of the Coma cluster