Detection of an hα emission line on a quasar, RX J1759.4+6638, at z = 4.3 with AKARI

Shinki Oyabu, Takehiko Wada, Youichi Ohyama, Hideo Matsuhara, Toshinobu Takagi, Takao Nakagawa, Takashi Onaka, Naofumi Fujishiro, Daisuke Ishihara, Yoshifusa Ita, Hirokazu Kataza, Woojung Kim, Toshio Matsumoto, Hiroshi Murakami, Itsuki Sakon, Toshihiko Tanabé, Kazunori Uemizu, Munetaka Ueno, Fumihiko Usui, Hidenori WataraiKanae Haze

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)S497-S501
JournalPublications of the Astronomical Society of Japan
Issue numberSPEC. ISS. 2
Publication statusPublished - 2007
Externally publishedYes


  • Galaxies: quasars: emission lines
  • Infrared: spectroscopy

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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