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For refcode 1992A&A...256..343M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1992A&A...256..343M A new straight arc detected in a cluster of galaxies at z = 0.423 G. Mathez, B. Fort, Y. Mellier, J.-P. Picat, and G. Soucail Laboratoire d'Astrophysique de Toulouse, Observatoire Midi-Pyrenees, 14 Avenue E. Belin, F-3 1400 Toulouse, France Received November 19, accepted December 24, 1991 Abstract. We report on the discovery of a blue arc north of the brightest galaxy (G1) in the cluster of galaxies Cl0302+1658. Extending over more than 10" for a curvature radius larger than 1 arcmin, this arc A1 is the third "straight" arc discovered so far. A smaller arc A2 (8" long) is embedded in the southern envelope of G1, but is certainly not a counter arc of Al. A somewhat bluer and fainter arclet lies close to the Al western end. The B-R and R-I color indices of Al indicate that its redshift is likely to range around z = 0.8, while the shape and the higher surface brightness of A2 point to a lower redshift. We give the B, R and I photometry of a sample of 36 galaxies in the cluster center, complete to the limiting magnitude B = 25. Four spectra of member galaxies confirm the cluster redshift z = 0.424 given by Stocke et al. (1991). A model of the gravitational lensing configuration reproduces quite well the shape of both arcs, assuming two sources at redshift z = 0.8 for Al, and 0.6 for A2. It includes the gravitational effects of the whole cluster (velocity dispersion 1100 km s^-1^) and of the second brightest galaxy G2 (velocity dispersion 450 km s^-1^) Key words: clusters of galaxies - photometry - arcs - gravitational lensing
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