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

重子宇宙的观测探索和下一代X射线任务

• 批准号: 20340041
• 负责人: SUTO Yasushi
• 金额: $ 12.06万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20340041/
• 关键词: 宇宙論; X 線天文学; ダークバリオン; 流体シミュレーション; ハッブル定数; X線天文学; 宇宙物理学; 銀河団; 軟X線分光

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.

我们对宇宙暗重子最可能的候选者WHIM（Warm-Hot Intergalactic Medium）的可探测性进行了批判性的讨论。我们的各种分析在日本、美国和荷兰关于空间使命起源的联合建议中发挥了重要作用，遗憾的是，该建议没有被接受。然而，我们计划为即将到来的日本小型空间使命计划提交DIOS提案。特别是，我们成功地模拟了星系团的气体密度和温度的不均匀性统计。然后，我们指出了一个系统性的错误估计的哈勃常数使用集群。最后，我们还考虑了流体静力平衡的有效性，这是传统上假设在分析星系团的X射线数据。我们的结果基于一组模拟的集群表明，该假设导致近似百分之二十的差异，从真正的集群质量。

项目成果

A Statistical Approach to Galaxy Cluster Gas Inhomogeneity : Chandra Observations of Nearby Galaxy Clusters

星系团气体不均匀性的统计方法：附近星系团的钱德拉观测

• 发表时间: 2009
• 作者: Reese;他
• 通讯作者: 他

Revisiting the Hubble Constant Measurement from the Sunyaev-Zel'dovich Effect

从 Sunyaev-Zeldovich 效应重新审视哈勃常数测量

• 发表时间: 2009
• 作者: Hajime Kawahara;Tetsu Kitayama;Shin Sasaki;Yasushi Suto
• 通讯作者: Yasushi Suto

Inhomogeneities in galaxy clusters

星系团中的不均匀性

• 发表时间: 2009
• 作者: T.Suzuki;et al.;横山央明;Yasushi Suto
• 通讯作者: Yasushi Suto

主役はダーク

黑暗是主角

• 发表时间: 2013
• 作者: Sumi;T.;Abe;F.;他;須藤靖
• 通讯作者: 須藤靖

人生一般ニ相対論

一般二元理论中的生活

• 发表时间: 2010
• 作者: Ryu;Y.-H.;他;末原大幹;T. Horigane and Y. Kazama;松元亮治;T.Ozawa;須藤靖
• 通讯作者: 須藤靖