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

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Oyabu, Shinki
Wada, Takehiko
Ohyama, Youichi
Matsuhara, Hideo
Takagi, Toshinobu
Nakagawa, Takao
Onaka, Takashi
Fujishiro, Naofumi
Ishihara, Daisuke
Ita, Yoshifusa
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Abstract
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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.
Comment: 9pages, 3 figures, Publications of the Astronomical Society of Japan, in press
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Astrophysics
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