Spectroscopy of the gravitational arcs in CL 2244 - 02, A370 (arclet A5), and CL 0024 + 1654

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Astronomical Spectroscopy, Galactic Clusters, Galactic Evolution, Gravitational Effects, Absorption Spectra, Arcs, Emission Spectra, Lyman Alpha Radiation, Red Shift, Star Formation Rate

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Recent spectroscopic data on the blue giant arc in Cl 2244 - 02, on the arclet A5 in Abell 370, and on the split arc in Cl 0024 + 1654 are analyzed. A probable redshift of 2.237 is derived for the source of the Cl 2244 - 02 arc, making this object one of the most distant 'field' galaxies known to date. A star formation rate is estimated from the Ly-alpha intensity and compared to other distant field galaxies. For A5, no prominent emission line is found, but three absorption lines indicate a tentative redshift of 1.306. The spectra of the four parts of the Cl 0024 + 1654 arc look quite similar, but the absence of any spectral feature allows only the determination of a redshift range between 1 and 2.1.

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