Study of thermal and chemical history of baryon
| Project/Area Number |
22540256
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Tokyo University of Science |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | X線天文学 / 銀河 / 銀河団 / 宇宙の大構造 |
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| Research Abstract |
We studied distribution of metals in intracluster medium of clusters of galaxies, and found that metals synthesized early phase in cluster formation. In addition, we derived total Fe mass in the intracluster medium out to the virial radius for the first time. Comparing the Fe mass and stellar mass, we constrained the initial mass function of stars in cluster galaxies, and supernova Ia rate in the past. We also studied thermal properties in the intracluster medium of cluster outskirt out to the virial radius. Especially, we found that the entropy profiles of the intracluster medium do not depend on the system mass, when scaled with average temperature of the intracluster medium. Beyond a half of the virial radius, the entropies of the ICM are systematically lower than the predicted valuesassuming pure gravitational heating. We also found that the hydrostatic mass is smaller than the gravitational mass derived from gravitational lens observations. This result indicates that the intracluster medium in the cluster outskirt deviates from the hydrostatic equibrium. Infalling matter may have retained some of its kinetic energy in the form of bulk motions or turbulence.
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Report
(4 results)
Research Products
(33 results)
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[Journal Article] Distribution of Si2013
Author(s)
Matsushita, K., T. Sato, E. Sakuma, & K. Sato
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Journal Title
Fe, and Ni in the Intracluster Medium of the Coma Cluster Publications of the Astronomical Society of Japan
Volume: v65
Pages: 10-10
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[Journal Article] Observations of the Fornax Cluster: Temperature and Metallicity Distribution2011
Author(s)
Murakami, H., M. Komiyama, K. Matsushita, R. Nagino, T. Sato, K. Sato, M. Kawaharada, K. Nakazawa, T. Ohashi, & Y. Takei Suzaku and XMM‐Newton
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Journal Title
Publications of the Astronomical Societyof Japan
Volume: v63
Pages: 963-963
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[Journal Article] Abundance Patterns in the Interstellar Medium of the SO Galaxy NGC 1316 (Fornax A) Revealed with Suzaku2010
Author(s)
Konami, S., Matsushita, K., Nagino, R., Tashiro, M., Tamagawa, T., Makishima, K
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 62
Pages: 1435-1443
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Peer Reviewed
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