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Other Ways to Find
High Redshift Sources

Objects at these redshifts can also be found by looking for objects with very peculiar colors at the red wavelength ... the so-called "color break searches", and the Sloan Digital Sky Survey found a number of very luminous quasars beyond a redshift of 6 ( Fan et al. 2004).

The figure shows the highest redshift of these quasars at 6.39. This spectrum is a high resolution (R=5000) very deep exposure taken with the ESI spectrograph on the Keck 10m telescope by Songaila 2004. Note the enormous drop in the flux of the spectrum just below 0.9 microns which is caused by the obscuration of the intergalactic gas.

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