We report on the detection of an Hα 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 Ha emission line in a quasar beyond z =4. The overall spectral energy distribution (SED) of RX J1759.4+6638 in the near- and mid-infrared wavelengths agrees with a median SED of the nearby quasars; also, the flux ratio of F(Lyα)/F(Hα) is consistent with those of previous reports for lower-redshift quasars.
- Galaxies: quasars: emission lines
- Infrared: spectroscopy
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science