Astron. J., 123, 1-9 (2002/January-0)
Discovery of a z =0.77 galaxy cluster with multiple, bright, strong-lensing arcs.
GLADDERS M.D., YEE H.K.C. and ELLINGSON E.
Abstract (from CDS):
We report the discovery of a remarkable strong-lensing cluster from the ongoing Red-Sequence Cluster Survey (RCS). RCS 0224-0002, at a spectroscopic redshift of 0.773, lenses two to four separate background sources. These arcs are of relatively high surface brightness and hence amenable to detailed follow-up study. We provide preliminary photometry and spectroscopy of RCS 0224-0002 and discuss in detail the one lensed source for which a redshift has so far been determined. This galaxy, at a redshift of 4.8786, appears to be composed of a star-forming core enveloped in a Lyα emitting cloud. Moreover, it shows no measurable velocity structure to a limit of ∼50 km.s–1 over a region likely to be ∼1 kpc in size. The available data are also used to develop an initial lensing model, which shows RCS 0224-0002 to have a mass corresponding to a central velocity dispersion of ∼1000 km.s–1, consistent with the measured optical richness of the cluster. This preliminary model is also used to estimate redshifts for all lensed components visible in our ground-based imaging. RCS 0224-0002 is the highest-redshift cluster to show lensing with such a large number of bright arcs (comparable to the best lensing clusters at much lower redshifts), and the highest-redshift strong-lensing cluster for which both the cluster redshift and at least one source redshift have been established spectroscopically, and as such it provides a powerful opportunity to directly measure the geometry of the universe and galaxy properties at high redshift.
galaxies: clusters: individual (RCS 0224-0002) - Galaxies: Distances and Redshifts - Galaxies: High-Redshift - Cosmology: Gravitational Lensing
Text: RCS JHHMM+DDMM N=1. Table 1, Fig.2: [GYE2002] J0224-0002 A (Nos A-D). Fig.3: [GYE2002] J0224-0002 AN (Nos R1-R2).
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