Observational pursuit of the baryonic universe and the next-generation X-ray mission

我们已经批判性地解决了WIIM(温热星际介质)的可探测性，它被认为是宇宙暗重子最有可能的候选者。我们的各种分析在日本-美国-荷兰关于太空任务起源的联合提议中发挥了重要作用，不幸的是，该提议没有被接受。然而，我们计划为即将到来的日本小空间任务计划提交Dios提案。我们还构建了星系团内气体的详细模型。特别是，我们成功地对星系团气体密度和温度的不均匀性进行了统计模拟。然后，我们指出了使用星系团估计哈勃常数的一个系统误差。最后，我们还考虑了在分析星系团的X射线数据时通常假定的流体静力平衡的有效性。我们基于一组模拟星系团的结果表明，假设导致了与真实星系团质量大约20%的偏差。

We have critically addressed the detectability of WHIM (Warm-Hot Intergalactic Medium), which is supposed to be the most plausible candidate for cosmic dark baryon. Our various analysis played an important role in the Japan-US-Holland joint proposal of a space mission ORIGIN, which unfortunately was not accepted. We plan , however, to submit the proposal DIOS for an up-coming Japanese small space mission program.We also constructed a detailed model for the intracluster gas. In particular, we were successful in modeling the inhomogeneity of gas density and temperature of galaxy clusters statistically. Then we pointed out a systematic error in the estimate of the Hubble constant using clusters. Finally we also considered the validity of hydrostatic equilibrium, which has been conventionally assumed in analyzing the X-ray data of galaxy clusters. Our results based on a set of simulated clusters indicates that the assumption leads to approximately20 percent discrepancy from the true mass of clusters.