Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....123....1g&link_type=abstract
The Astronomical Journal, Volume 123, Issue 1, pp. 1-9.
Astronomy and Astrophysics
Astronomy
24
Galaxies: Clusters: Individual (Rcs 0224-0002), Galaxies: Distances And Redshifts, Galaxies: High-Redshift, Cosmology: Gravitational Lensing
Scientific paper
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. Based on observations made with ESO telescopes at the Paranal Observatory under program 266.A-5638, and on observations made with the Canada-France-Hawaii Telescope.
Ellingson Erica E.
Gladders Michael D.
Yee Howard K. C.
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