2015 Fiscal Year Final Research Report
X-ray study of metal distribution in the hot gas and stellar initial mass function
| Project/Area Number |
25400235
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SATO Kosuke 東京理科大学, 理学部第一部, 助教 (50453840)
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| Research Collaborator |
SASAKI Toru
ICHIKAWA Kazuya
KONAMI Saori
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | X線 / 銀河 / 銀河団 / 化学進化 / 構造形成 |
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| Outline of Final Research Achievements |
Clusters of galaxies are the largest gravitationally bound systems in the Universe. At the same time, clusters can be used as the laboratory for the study of thermal and chemical evolution of the universe in which baryons play the most important role. X-ray observations give us valuable information about the structure formation, gas heating and cooling, and metal enrichment of clusters of galaxies.
Thanks to the low and stable background, the Suzaku satellite has enabled us to unveil intracluster medium (ICM) beyond a half of the virial radius. We studied the distributions of metal abundances and metal-mass-to-light ratios and gas-mass-to-light ratios and discussed the origin of metals, slope of initial mass function of stars, and early-metal enrichment in these systems. In addition, we compared the results from the Suzaku data with those from the Planck satellite and weak-lensing observations and discussed the entropy flattening at cluster outskirts.
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| Free Research Field |
X線天文学
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