X-ray spectroscopic study for the evolution of hot plasmas in galaxies and clusters of galaxies

星系和星系团中热等离子体演化的 X 射线光谱研究

基本信息

批准号：
08404010
负责人：
OHASHI Takaya
金额：
$ 21.82万
依托单位：
TOKYO METOROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08404010/
关键词：
X-ray astronomy galaxies clusters of galaxies hot plasmas a detector of X-ray

项目摘要

The purpose of this research was to understand the formation and evolution process of hot gas in elliptical galaxies and in clusters of galaxies based on X-ray spectroscopic observations mainly from ASCA, and also to develop X-ray detectors with an energy resolution better than 10 eV for new X-ray mission including ASTRO-E. Theoretical study of the plasma processes was also carried out because of its close connection in understanding the X-ray spectral data. Main achievements in the individual research area are summarized as follows.1. ASCA observations: Spatial distributions of temperature and metal abundance were obtained for near-by bright clusters. Large scale abundance gradient indicated metal production in galaxies, and presence of hot regions in the clusters outskirts showed recent occurrence of mergers with subclusters. Metallicity in elliptical galaxies were determined to be about 1 solar, and greatly extended X-ray emission was discovered around bright galaxies.2. Theoretical study: Fe-L emission process has been examined and there exists and uncertainty of 30% in the abundance determination. Emission process from recombining plasmas were studied in detail and spectral difference from collisionally ionizing plasmas were compared.3. Hardware development: Calibrations of microcalorimeters on-board ASTRO-E were carried out and various detector properties were examined and included in the response function. Development of transition edge sensors for a future X-ray mission was carried out. Thermal properties of Mo-Au bilayers were studied, and a readout system of SQUID signals cooled in a dilution refrigerator has been developed.

这项研究的目的是了解基于X射线光谱观测的椭圆星系和星系中热气体的形成和演化过程，主要来自ASCA，并且还开发了X射线探测器，其能量分辨率大于包括Astro-E在内的新X射线任务的10 eV。由于其在理解X射线光谱数据方面的密切联系，还进行了血浆过程的理论研究。单个研究领域的主要成就总结如下1。 ASCA观察：对于近乎明亮的簇，获得了温度和金属丰度的空间分布。大规模丰度梯度表明星系中的金属产生，集群郊区的热区域表明，最近与子截面的合并发生了。椭圆星系中的金属性确定为约1个太阳能，并且在明亮的星系周围发现了X射线发射的大大扩展。2。理论研究：FE-L排放过程已经进行了研究，并且在丰度确定中存在30％的不确定性。详细研究了重组等离子体的排放过程，并比较了碰撞电离等离子体的光谱差异3。硬件开发：进行了板载Astro-E的微钙化器的校准，并检查了各种检测器特性并将其包括在响应函数中。开发了未来X射线任务的过渡边缘传感器。研究了mo-au双层的热性能，并开发了在稀释冰箱中冷却的鱿鱼信号系统。