THERMAL AND CHEMICAL EVOLUTIONS OF GALAXY CLUSTERS OBSERVED WITH SUZAKU

Authors

  • Kosuke Sato Department of Physics, Tokyo University of Science
  • Kyoko Matsushita Department of Physics, Tokyo University of Science
  • Yoshitaka Ishisaki Department of Physics, Tokyo Metropolitan University
  • Noriko Y. Yamasaki Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency
  • Takaya Ohashi Department of Physics, Tokyo Metropolitan University

DOI:

https://doi.org/10.14311/AP.2013.53.0583

Abstract

We studied the properties of the intracluster medium (ICM) of galaxy clusters to outer regions observed with Suzaku. The observed temperature dropped by about ~30% from the central region to the virial radius of the clusters. The derived entropy profile agreed with the expectation from simulations within r500, while the entropy profile in r > r500 indicated a flatter slope than the simulations. This would suggest that the cluster outskirts were out of hydrostatic equilibrium. As for the metallicity, we studied the metal abundances from O to Fe up to ~0.5 times the virial radius of galaxy groups and clusters. Comparing the results with supernova nucleosynthesis models, the number ratio of type II to Ia supernovae is estimated to be ~3.5. We also calculated not only Fe, but also O and Mg mass-to-light ratios (MLRs) with K-band luminosity. The MLRs in the clusters had a similar feature.

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Published

2013-12-18

Issue

Vol. 53 (2013): Supplement

Section

Articles

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How to Cite

Sato, K., Matsushita, K., Ishisaki, Y., Yamasaki, N. Y., & Ohashi, T. (2013). THERMAL AND CHEMICAL EVOLUTIONS OF GALAXY CLUSTERS OBSERVED WITH SUZAKU. Acta Polytechnica, 53(A), 583-588. https://doi.org/10.14311/AP.2013.53.0583