Astronomical Institute, Tohoku University
Astronomical Institute, Tohoku University
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University : Astronomical Institute, Tohoku University
Astronomical Institute, Tohoku University
Astronomical Institute, Tohoku University
Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS) : The Graduate University for Advanced Studies (SOKENDAI)
出版者
宇宙航空研究開発機構(JAXA)
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙航空研究開発機構特別資料
雑誌名(英)
JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life
巻
JAXA-SP-17-009E
ページ
345 - 346
発行年
2018-03-09
会議概要（会議名, 開催地, 会期, 主催者等）
第4回「あかり」国際会議 (2017年10月17-20日. 東京大学), 文京区, 東京
会議概要（会議名, 開催地, 会期, 主催者等）（英）
The 4th AKARI International Conference: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (October 17-20, 2017. The University of Tokyo), Bunkyo-ku, Tokyo, Japan
抄録（英）
Ultra- and Hyper-luminous IR galaxies (L(sub IR) greater than 10(exp 12) solar luminosity for ULIRGs and L(sub IR) greater than 10(exp 13) solar luminosity for HyLIRGs) are populations of galaxies with strong IR dust emission, which is associated with a powerful AGN activity. Currently, identifications of ULIRGs and HyLIRGs are dominated by broad-line QSOs, but existence of FIR with an extremely faint optical counterpart suggests that there are significant number of obscured QSOs among the FIR sources. Utilizing the unique sample of bright FIR sources in a wide survey field from AKARI FIS Bright Source Catalogue, we look for luminous type-2 QSOs at z in the order of 0.5-1 by identifying FIR sources with extremely large FIR to optical flux ratio. In order to reveal the nature of the optically-faint FIR sources and to kick-off a systematic search for type-2 QSOs at intermediate redshifts, we observed 8 AKARI 90 micrometers FIR sources with a faint optical counterpart (i greater than 20 mag) using FOCAS on the Subaru telescope. They are identified with emission line galaxies at z = 0.3-0.6. Through optical-MIR-FIR SED fitting, their integrated IR luminosity are estimated to be 10(exp 12-12.5) solar luminosity. The identification of these ULIRGs at intermediate redshifts confirms the effectiveness of our selection method. One of these objects shows broad brackets O III brackets 5007 angstroms (FWHM of 2200 km s(exp -1) with blue shift of 2300 km s(exp -1)) and brackets O II brackets 3726 angstroms emission lines (FWHM of 1100 km s(exp -1)). The co-existence of extreme outflow and high SFR (in the order of 1000 solar mass yr(exp -1)) suggest the galaxy evolves into its most active stage when both of the AGN and star formation activities reach the peak period.
内容記述
形態: カラー図版あり
内容記述（英）
Physical characteristics: Original contains color illustrations
A systematic search for ULIRGs/HyLIRGs at intermediate redshifts with optically-faint AKARI FIS Bright sources
AA1730026068.pdf
(196.47KB)
