Other
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sgyu.conf....9i&link_type=abstract
Studies of Galaxies in the Young Universe with New Generation Telescope, Proceedings of Japan-German Seminar, held in Sendai, Ja
Other
Scientific paper
The Subaru first light observation of CL0939+4713 (z=0.4), carried out in January 1999, yielded the detection of five EROs with R-K'>5 (Iye et al., PASJ, 52, 9, 2000) Among them the ERO R1 with its extreme colors, R-K'=7.5, J-K'=1.9, and K'=18.4, and the elongated shape (3"8x1"8) attracted our attention. The IRCS H-band grism spectroscopy failed to show emission lines expected from dusty starburst galaxies but by cross correlating the H-band SED with passively evolved galaxy models, we estimated its redshift at 1.48. On the other hand, photometric redshift of 1.72 is derived from R, I, J, H, K photometry. We are making tentative analysis to reconstruct the unlensed image of R1 assuming various gravitational lensing geometry of CL0939+4713. It is shown that the symmetric shape of the image of R1 is not consistent with lens elongated images of elliptical galaxies. We therefore conclude that the R1 is actually a galaxy with developed stellar disk component at a redshift 1.5. This finding will place a rather strong observational constraint on the formation processes of disk component of galaxies.
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