Precise Measurements of the Hubble Constant and Structures of Clusters of Galaxies

哈勃常数和星系团结构的精确测量

• 批准号: 14540230
• 负责人: MIYOSHI Shigeru
• 金额: $ 1.66万
• 依托单位: Kyoto Sangyo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540230/
• 关键词: clusters of galaxies; high temperature plasma; Sunvaev-Zel'dovich effect; Hubble constant; dark matter; density fluctuation; gravitational lensing; density distribution; 密度ゆらぎ; X線天文学; 天体プラズマ; 宇宙膨張; X線表面輝度分布; ダークマター; 等温ベータモデル

On the theoretical and observational investigations of the structure of clusters of galaxies, we established a new model of intracluster gas distribution. The fitting of our model with observational data is considerably better than the isothermal beta model, and the cluster mass distribution derived by using our model has a tendency to solve the discrepancy between the values obtained from the X-ray and the gravitational-lensing data. We made also the analysis of X-ray data of A2029 obtained with XMM-Newton. A2029 is a typical cD-type cluster of galaxies having a giant cD galaxy in the center. Although the data analysis of this cluster is still going on, many interesting results have been obtained. For example, in the central region a two-temperature model is preferred to some ordinary single temperature models.On the measurement of the Hubble constant, Ho, using the Sunyaev-Zel'dovich effect, we succeeded to obtain available data for five distant (0.143【less than or equal】z【less than or equal】0.282) clusters of galaxies observed with ROSAT, ASCA (X-ray) and the Ryle Telescope (radio). The obtained value of Ho for these clusters are considerably scattered, and their mean value is 66+11/-10 (random) +9/-8 (systematic) km/s/Mpc for a ACDM (ΩM=0.3, ΩA=0.7) flat universe. This value of Ho is slightly less than the value of Ho=71±2 km/s/Mpc obtained from WMAP observations of the cosmic microwave background radiation, but they are in good agreement within their errors.

Caraxies结构的理论注入观察数据的拟合效果更好，等温β模型R模型倾向于从X射线获得的值和重为性镜头数据之间的差异A2029的X射线数据在中心的XMM-NEWTON中获得了银河系。使用Sunyaev-Zel'Dovich效应S以相当于或等于] Z [小于或等于] 0.282）在使用Rosat，ASCA（X射线）观察到的星系簇的测量。对于群集，s 66 +11/-10（随机） +9/-8（ACDM的系统km/s/mpc（ωm= 0.3，ωa= 0.7）。观察宇宙微波背景辐射，但它们在错误中非常吻合。

项目成果

Masaharu Nishio, Katsunori Shimomura: "A characterization of caloric morphisms between manifolds"Ann.Acad.Sci.Fenn.Math.. (to appear).

Masaharu Nishio、Katsunori Shimomura：“流形之间热量态射的表征”Ann.Acad.Sci.Fenn.Math..（待发表）。

ASCA and XMM-Newton Observations of A2029

ASCA 和 XMM-Newton 对 A2029 的观测

• 发表时间: 2005
• 期刊: Advances in Space Research (印刷中)
• 作者: S.Miyoshi;他6名
• 通讯作者: 他6名

中井三留, 瀬川重男: "被覆面の型"数理解析研究所講究録. 1277. 84-93 (2002)

Miru Nakai，Shigeo Sekawa：“覆盖表面的类型”数学分析研究所的 Kokyuroku。1277. 84-93 (2002)。

Tracing Bright and Dark Sides of the Universe with X-ray Observations

通过 X 射线观测追踪宇宙的光明面和黑暗面

• 发表时间: 2004
• 期刊: Journal of the Korean Astronomical Society 37
• 作者: Y.Suto;K.Yoshikawa;et al.
• 通讯作者: et al.

R.Saunders, S.J.Miyoshi, Y.Tawara 他14名: "A measurement of Ho from Ryle Telescope, ASCA and ROSAT observations of Abell 773"Monthly Notices of the Royal Astronomical Society. 341. 937-940 (2003)

R.Saunders、S.J.Miyoshi、Y.Tawara 和其他 14 人：“来自 Ryle 望远镜、ASCA 和 ROSAT 对 Abell 773 观测的 Ho 测量”皇家天文学会月刊 341. 937-940 (2003)。