Department of Physics, Kanazawa University
Department of Physics, Kanazawa University
Department of Physics, Kyoto University
Department of Physics, Kyoto University
Department of Physics and Astrophysics, Nagoya University
出版者
宇宙航空研究開発機構
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 Energetic Cosmos; from Suzaku to ASTRO-H
巻
JAXA-SP-09-008E
ページ
364 - 366
発行年
2010-02-26
会議概要（会議名, 開催地, 会期, 主催者等）（英）
The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan
抄録（英）
We calibrated the peak energy-peak luminosity relation of GRBs (so called E(sub p) - L(sup p) ; Yonetoku relation) using 52 events with the redshift z < 1.755 without assuming any cosmological models. The luminosity distances to GRBs are estimated from those of large amount of Type Ia supernovae with z < 1.755. This calibrated E(sub p) - L(sup p) relation can be used as a new cosmic distance ladder toward higher redshifts. We determined the luminosity distances of 36 GRBs in 1.8 < z < 8.3 using the calibrated relation and plotted the likelihood contour in (omega(sub m), omega(sub lamda) plane. We obtained (Omega(sub m), Omega(sub lamda) = (0.37(sup +0.14)(sub -0.11), 0.63(sup +0.11)(sub -0.14) for a flat universe. We can say that our universe in 1.8 < z < 8.3 is compatible with the cosmological model derived for z 1< 1.8. This suggests that the time variation of the dark energy may be small or zero up to z approximately 8.
内容記述（英）
Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science
The dark energy measurement in the early universe with Gamma-Ray Bursts
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