The system of arcs in the cluster of galaxies Abell 2218 - Photometry, spectroscopy and geometry

Details The system of arcs in the cluster of galaxies Abell 2218 - Photometry, spectroscopy and geometry The system of arcs in the cluster of galaxies Abell 2218 - Photometry, spectroscopy and geometry

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266....6p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 6-14.

Astronomy and Astrophysics

Astrophysics

56

Astronomical Photometry, Astronomical Spectroscopy, Galactic Clusters, Gravitational Lenses, Astronomical Models, Color-Magnitude Diagram, Emission Spectra, Galactic Structure, Red Shift

Scientific paper

We analyze new photometric and spectroscopic data on the system of arcs in the center of the rich cluster of galaxies A2218. 32 arc(let)s have been identified in the field, with colors compatible with high redshift galaxies (z greater than 0.6) in most cases. From the spectroscopic survey, it is found that A2218 exhibits a complex dynamical structure, with a possible double system formed by the central cD and galaxies greater than 244 and 259. This point is also confirmed by the arc(let)s configuration. For the first time, we give spectroscopic results for three arc structures. We discuss the identification of two arcs as high redshift objects (z = 1.034 and z = 0.702, respectively), result that allows the confirmation of the gravitational lens hypothesis. The whole spectroscopic, photometric and geometric information required for the construction of a model for the cluster potential is given.

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