RX J0911+05: A Massive Cluster Lens at z=0.769

Details RX J0911+05: A Massive Cluster Lens at z=0.769 RX J0911+05: A Massive Cluster Lens at z=0.769

2000-06-08

arxiv.org/abs/astro-ph/0006106v1

Astrophys.J. 544 (2000) L35-L39

Astronomy and Astrophysics

Astrophysics

Submitted to ApJL, 7 pages, 5 figures

Scientific paper

10.1086/317285

We report the detection of a massive high-redshift cluster of galaxies near the quadruple quasar RX J0911+05, using the LRIS instrument on the Keck-II telescope. The cluster is found to have a mean redshift of =0.7689+/-0.002 and a velocity dispersion of sigma=836{+180-200} km/s, based on redshift measurements for 24 member galaxies. This massive high-redshift cluster is the origin of the unusually large external shear required by lensing models of the quadruple quasar system. We predict the expected time delay depending on the exact contribution of the cluster. A measurement of the time delay and further deep lensing and X-ray observations will unravel useful properties of this serendipitously discovered high-redshift cluster, and may put interesting cosmological constraints on H0.

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