Weak Lensing by Two Z approximately 0.8 Clusters of Galaxies

Details Weak Lensing by Two Z approximately 0.8 Clusters of Galaxies Weak Lensing by Two Z approximately 0.8 Clusters of Galaxies

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...497l..61c&link_type=abstract

Astrophysical Journal Letters v.497, p.L61

Astronomy and Astrophysics

Astronomy

91

Cosmology: Observations, Cosmology: Dark Matter, Cosmology: Gravitational Lensing, Galaxies: Distances And Redshifts, Galaxies: Clusters: Individual Alphanumeric: Ms 1137+66, Galaxies: Clusters: Individual Alphanumeric: Rxj 1716+67

Scientific paper

We report the detection of weak gravitational lensing of distant background galaxies by two rich, X-ray-luminous clusters of galaxies, MS 1137+66 at z=0.783 and RXJ 1716+67 at z=0.813 . We detect a shear signal in each cluster over the radial range 100<=r<= 700 h^{-1} kpc. Assuming that the background galaxies lie in a sheet at z=2 , we measure a mass of 2.45x1014 h^{-1} Msolar and M/LV=270 at 500 h^{-1} kpc radius for MS 1137+66 and a mass of 2.6x1014 h^{-1} Msolar and M/LV=190 for RXJ 1716+67 at the same radius. Both the optical light maps and the weak lensing mass maps of RXJ 1716+67 show two spatially distinct subclusters, as well as a long filamentary structure extending out of the cluster to the northeast. In contrast, MS 1137+66 is an ultracompact massive cluster in both mass maps and optical light maps and contains a strongly lensed arc system in the cluster core. These data add to the growing number of massive clusters at z>~0.8 .

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