Weak lensing analysis of Cl 1358+62 using Hubble Space Telescope observations
Abstract
We report on the detection of weak gravitational lensing of faint, distant background galaxies by Cl 1358+62, a cluster of galaxies at a redshift of z=0.33. The observations were made using the HST. The HST point spread function is highly anisotropic at the edges of the individual chips. This systematically perturbs the shapes of objects and we present a method for applying the appropriate correction. The measured shear is consistent with a velocity dispersion of 980+-65 km/s in excellent agreement with previous mass estimates. The mass distribution is elongated similar to the light. The axis ratio of 0.30+-0.15 and position angle of -21+-8 degrees were measured directly from the observed shear and agree very well with a previous strong lensing analysis. We estimate the mass-to-light ratio to be 99+-15 h50 M_sun/L_Vsun.Keywords
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