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ERO R1 in the field of CL0939+4713 – Evidence for an SO-like galaxy at z ~ 1.5

  • M. Iye (a1), N. Kashikawa (a1), M. Imanishi (a1), T. Kodama (a1), M. Chiba (a1), K. Shimasaku (a2), S. Okamura (a2), S. Miyazaki (a3), C. Simpson (a3), N. Kobayashi (a3), H. Terada (a3), M. Goto (a3) and F. Iwamuro (a4)...

Abstract

An elongated ERO with R - K′ = 7.5 behind the cluster A851 at z=0.4 was found to lie at z = 1.5 both by the photometric redshift and by a cross correlation method of its H-band SED with local E/SO spectra. the luminosity profile is well represented by a seeing convolved exponential disk, and the lack of redshifted H-alpha emission indicates that it has a dynamically relaxed disk with an old stellar population. Gravitational lensing of the cluster is not strong enough to stretch the image and cannot convert the de Vaucouleurs law into an exponential law.

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