| Project/Area Number |
16340053
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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 (2007) The University of Tokyo, Department of Physics, Professor (90183053)
須藤 靖 (2004-2006) The University of Tokyo, 大学院・理学系研究科, 教授 (20206569)
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| Co-Investigator(Kenkyū-buntansha) |
TARUYA Atsushi The University of Tokyo, Department of Physics, Assistant Professor (40334239)
OHASHI Takaya Tokyo Metropolitan University, Department of Physics, Professor (70183027)
SASAKI Shin Tokyo Metropolitan University, Department of Physics, Assistant Professor (80262260)
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| Project Period (FY) |
2004 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥15,920,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2007: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2006: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2004: ¥4,400,000 (Direct Cost: ¥4,400,000)
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| Keywords | astrophysics / X-ray astronomy / dark baryon / cluster of galaxies / soft X-ray spectroscopy / gamma-ray burst / 酸素輝線 / 銀河間物質 / 軟X線分光観測 / DIOS |
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| Research Abstract |
1) We developed and ran a cosmological hydro-code with our German collaborator, Dr. Klaus Dolag. The code takes account of a variety of physical processes including radiative cooling, star formation, gas heating due to supernovae, chemical evolution.
2) Using the above simulation results, we constructed a mock galaxy catalog in the Local Universe, and discussed the detection feasibility of WHIM (warm-hot intergalactic medium) associated with outskirts of nearby galaxy clusters via oxygen emission lines (Yoshikawa et al. 2004).
3) We also studied the detection feasibility of absorption lines of WHIM using the background quasars and X-ray after glow of gamma-ray bursts (Kawahara et al. 2006).
4) It has been pointed out that the element abundance in WHIM does not obey the ionization equilibrium. We followed the time evolution of the oxygen ionization states using the simulation data, and indeed showed that the ionization equilibrium is not valid in WHIM. We found that the intensity ratio of oxygen lines in different ionization states is a good indicator of the departure from the ionization equilibrium (Yoshikawa and Sasaki 2006).
5) We proposed a new empirical analytic model for temperature and density inhomogeneities in intra-cluster medium, and showed that this nice explains the observation data of galaxy cluster A3667 from Chandra X-ray satellite (kawahar et al.2007,2008).
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