Detection of Hα emission from z>3.5 galaxies with AKARI-FUHYU NIR spectroscopy

Sedgwick, Chris; Serjeant, Stephen; Pearson, Chris; Takagi, Toshinobu; Matsuhara, Hideo; Wada, Takehiko; Lee, Hyung Mok; Im, Myungshin; Jeong, Woong-Seob; Oyabu, Shinki and White, Glenn J. (2012). Detection of Hα emission from z>3.5 galaxies with AKARI-FUHYU NIR spectroscopy. Publications of The Korean Astronomical Society, 27(4) pp. 357–360.

DOI: https://doi.org/10.5303/PKAS.2012.27.4.357

Abstract

This paper presents Hα emission line detections of four galaxies at z > 3.5 made with AKARI as part of the FUHYU programme. These are the highest redshift Hα detections to date in star-forming galaxies. AKARI's unique near-infrared spectroscopic capability has made these detections possible. For two of these galaxies, this represents the first evidence of their redshifts and confirms their physical association with a companion radio galaxy. The star formation rates (SFRs) estimated from the AKARI's unique near-infrared spectroscopic capability has made these detections possible. For two of these galaxies, this represents the first evidence of their redshifts and confirms their physical association with a companion radio galaxy. The star formation rates (SFRs) estimated from the Hα lines under-predict the SFRs estimated from their far-infrared luminosities by a factor of ~ 2 - 3. We have also detected broad Hα components in the two radio galaxies which indicate the presence of quasars.

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