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Detection of an H$\alpha$ Emission Line on a Quasar, RX J1759.4$+$6638, at<i>Z</i>= 4.3 with AKARI
We report on the detection of an H$\alpha$ emission line in the low-resolution spectrum of a quasar, RX J1759.4$+$6638, at a redshift of 4.3 with the Infrared Camera (IRC) onboard AKARI. This is the first spectroscopic detection of an H$\alpha$ emission line in a quasar beyond $z =$ 4. The …