Discovery of a new high redshift QSO at z=5.96 with the Subaru telescope
Abstract
We report a discovery of a new high redshift quasar at z=5.96, observed with the FOCAS long-slit spectrograph on board the Subaru telescope. The spectrum shows strong and broad Lyα+NV emission lines with a sharp discontinuity to the blue side. A Lyβ+OVI emission line is also detected, providing a consistent redshift measurement with the Lyα+NV emission. The QSO has an absolute magnitude of MAB,1450=-26.9 (H0=50km s-1 Mpc-1, q0=0.5). The spectrum shows significant flux in the region 8000-8300 and thus does not show a complete Gunn-Peterson trough in the redshift range 5.58 to 5.82, along the line of sight to this z=5.96 QSO. Therefore the Universe was already highly ionized at z=5.82
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