This paper presents Hα emission line detections for four galaxies at z > 3.5 made with AKARI as part of the FUHYU mission program. 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 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.

ABSTRACT
1. INTRODUCTION
2. DATA REDUCTION
3. RESULTS
4. CONCLUSIONS
REFERENCES

• CHRIS SEDGWICK(Department of Physical Sciences, The Open University)
• STEPHEN SERJEANT(Department of Physical Sciences, The Open University)
• CHRIS PEARSON(RAL Space, Rutherford Appleton Laboratory, Department of Physical Sciences, The Open University)
• TOSHINOBU TAKAGI(Institute of Space and Astronautical Science, JAXA)
• HIDEO MATSUHARA(Institute of Space and Astronautical Science, JAXA)
• TAKEHIKO WADA(Institute of Space and Astronautical Science, JAXA)
• HYUNG MOK LEE(Department of Physics and Astronomy, Seoul National University)
• MYUNGSHIN IM(Department of Physics and Astronomy, Seoul National University)
• WOONG-SEOB JEONG(Korea Astronomy & Space Science Institute)
• SHINKI OYABU(Graduate School of Science, Nagoya University)
• GLENN J. WHITE(Department of Physical Sciences, The Open University, RAL Space, Rutherford Appleton Laboratory)