A new straight arc detected in a cluster of galaxies at Z = 0.423

Details A new straight arc detected in a cluster of galaxies at Z = 0.423 A new straight arc detected in a cluster of galaxies at Z = 0.423

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..343m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 2, p. 343-350.

Astronomy and Astrophysics

Astrophysics

35

Arcs, Astronomical Photometry, Galactic Clusters, Astronomical Models, Astronomical Spectroscopy, Color-Magnitude Diagram, Gravitational Lenses, Red Shift

Scientific paper

We report on the discovery of a blue arc north of the brightest galaxy (G1) in the cluster of galaxies C10302+1658. Extending over more than 10 arcsec for a curvature radius larger than 1 arcrain, this arc A1 is the third 'straight' arc discovered so far. A smaller arc A2 is embedded in the southern envelope of G1, but is certainly not a counter arc of A1. A somewhat bluer and fainter arclet lies close to the A1 western end. The B-R and R-I color indices of A1 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 A1, and 0.6 for A2, It includes the gravitational effects of the whole cluster and of the second brightest galaxy G2.

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