2011 Fiscal Year Final Research Report
Observational pursuit of the baryonic universe and the next-generation X-ray mission
| Project/Area Number |
20340041
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SUTO Yasushi 東京大学, 大学院・理学系研究科, 教授 (90183053)
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Shin 首都大学東京, 理工学研究科, 助教 (80262260)
KITAYAMA Tetsu 東邦大学, 理学部, 教授 (00339201)
YOSHIKAWA Kohji 筑波大学, 数理物質科学研究科, 講師 (70451672)
YAMASAKI Noriko 宇宙航空研究開発機構, 宇宙科学研究本部, 准教授 (20254146)
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| Project Period (FY) |
2008 – 2011
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| Keywords | 宇宙論 / X 線天文学 / ダークバリオン / 流体シミュレーション / ハッブル定数 |
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| Research Abstract |
We have critically addressed the detectability of WHIM (Warm-Hot Intergalactic Medium), which is supposed to be the most plausible candidate for cosmic dark baryon. Our various analysis played an important role in the Japan-US-Holland joint proposal of a space mission ORIGIN, which unfortunately was not accepted. We plan , however, to submit the proposal DIOS for an up-coming Japanese small space mission program.We also constructed a detailed model for the intracluster gas. In particular, we were successful in modeling the inhomogeneity of gas density and temperature of galaxy clusters statistically. Then we pointed out a systematic error in the estimate of the Hubble constant using clusters. Finally we also considered the validity of hydrostatic equilibrium, which has been conventionally assumed in analyzing the X-ray data of galaxy clusters. Our results based on a set of simulated clusters indicates that the assumption leads to approximately20 percent discrepancy from the true mass of clusters.
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[Journal Article] DIOS: the diffuse intergalactic oxygen surveyor: status and prospects2010
Author(s)
T.Ohashi, Y.Ishisaki, Y.Ezoe, S.Sasaki, H.Kawahara, K.Mitsuda, N.Yamasaki, Y.Takei, M.Ishida, Y. Tawara, I.Sakurai, A.Furuzawa, Y.Suto, K.Yoshikawa, N.Kawai, R.Fujimoto, T.G.Tsuru, K.Matsushita, and T.Kitayama
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Journal Title
SPIE
Volume: 7732
Pages: 77321S-77321S-9
Peer Reviewed
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