| 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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| 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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