Detection of an H-alpha Emission Line on a Quasar, RX J1759.4+6638, at   z=4.3 with AKARI

Shinki Oyabu (1); Takehiko Wada (1); Youichi Ohyama (1); Hideo; Matsuhara (1); Toshinobu Takagi (1); Takao Nakagawa (1); Takashi Onaka (2),; Naofumi Fujishiro (1); Daisuke Ishihara (2); Yoshifusa Ita (1); Hirokazu; Kataza (1); Woojung Kim (1); Toshio Matsumoto (1); Hiroshi Murakami (1),; Itsuki Sakon (2); Toshihiko Tanabe (3); Kazunori Uemizu (1); Munetaka Ueno; (4); Fumihiko Usui (1); Hidenori Watarai (5); and Kanae Haze (1); ((1)Institute of Space; Astronautical Science; Japan Aerospace Exploration; Agency; (2)Department of Astronomy; School of Science; University of Tokyo,; (3)Institute of Astronomy; University of Tokyo; (4)Department of Earth; Science; Astronomy; University of Tokyo; (5)Office of Space Applications,; Japan Aerospace Exploration Agency)

arXiv:0706.0253·astro-ph·May 13, 2015

Detection of an H-alpha Emission Line on a Quasar, RX J1759.4+6638, at z=4.3 with AKARI

Shinki Oyabu (1), Takehiko Wada (1), Youichi Ohyama (1), Hideo, Matsuhara (1), Toshinobu Takagi (1), Takao Nakagawa (1), Takashi Onaka (2),, Naofumi Fujishiro (1), Daisuke Ishihara (2), Yoshifusa Ita (1), Hirokazu, Kataza (1), Woojung Kim (1), Toshio Matsumoto (1)

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TL;DR

This paper reports the first spectroscopic detection of an H-alpha emission line in a quasar at redshift 4.3 using AKARI, confirming the presence of this feature at such high redshift and analyzing its spectral properties.

Contribution

First detection of H-alpha emission in a quasar beyond redshift 4, expanding understanding of high-redshift quasar spectra.

Findings

01

H-alpha emission detected at z=4.3 in quasar RX J1759.4+6638

02

Spectral energy distribution matches median of nearby quasars

03

Flux ratio F(Ly-alpha)/F(H-alpha) consistent with lower-redshift quasars

Abstract

We report 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 the AKARI. This is the first spectroscopic detection of an H-alpha 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 and the flux ratio of F(Ly-alpha)/F(H-alpha) is consistent with those of previous reports for lower-redshift quasars.

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