TY - JOUR AU - Sato, Kosuke AU - Matsushita, Kyoko AU - Ishisaki, Yoshitaka AU - Yamasaki, Noriko Y. AU - Ohashi, Takaya PY - 2013/12/18 Y2 - 2024/03/28 TI - THERMAL AND CHEMICAL EVOLUTIONS OF GALAXY CLUSTERS OBSERVED WITH SUZAKU JF - Acta Polytechnica JA - Acta Polytech VL - 53 IS - A SE - Articles DO - 10.14311/AP.2013.53.0583 UR - https://ojs.cvut.cz/ojs/index.php/ap/article/view/1909 SP - 583-588 AB - 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 <em>r<sub>500</sub></em>, while the entropy profile in<em> r &gt; r<sub>500</sub></em> 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. ER -