Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-11-10
New Astron.Rev. 42 (1998) 137-140
Astronomy and Astrophysics
Astrophysics
22 pages, with 21 figures (3 plots omitted). Revised velocity dispersion and M/L. Accepted for publication in the ApJ. Full ve
Scientific paper
10.1016/S1387-6473(98)00035-9
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 measured shear is consistent with a velocity dispersion of 780+-50 km/s. The weak lensing mass is slightly lower than dynamical estimates and agrees well with X-ray 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 90+-13 h50 M_sun/L_Vsun. 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.
Franx Marijn
Hoekstra Henk
Kuijken Koen
Squires Gordon
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