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Study of Poor Cluster of Galaxies with X-ray

用X射线研究贫星系团

基本信息

批准号：
05452020
负责人：
TSURU Takeshi
金额：
$ 3.84万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452020/
关键词：
X-ray Astrophysics Cluster of Galaxies Galaxy X線天体物理学銀河・銀河団

项目摘要

Following new results were obtained from the observations of early type galaxies with ASCA.1.X-ray spectrum consists of a low temperature plasma component and a hard component. 2.The hard component is dominated by LMXB.3.Abundances of heavy elements are about a half solar value. 4.A positive correlation is seen between X-ray luminosity and temperature of the plasma component. ASCA observation of M87 at the center of the Virgo cluster of galaxies shows as follows ; 1.X-ray emitting plasma in M87 consists of a high temperature component bounded by the cluster gravity and a low temperature component bounded by M87.2.Apparent iron concentration at the M87 center is seen. Heavy metals contained by poor clusters are thought to be ejected from primordial-galaxies. Starburst galaxies are proto-type of such early phase of galaxies. Observations of the starburst galaxy M82 shows following results ; 1.Oxygen lines expected to be synthesized by type II SN are weak. 2.Iron abundance is low. 3.On the other hand, silicon and sulfa are rich. 4.The results indicate that the origin of metals in poor clusters cannot be explained simply by ejection from starburst galaxies. The observation of a distant poor cluster of galaxies MS0839.8 at z=0.194 shows the following results ; 1.No difference on temperature and X-ray luminosity between near and distant clusters is seen. 2.The result implies no strong evolution has not been occurred from z=0.2 until the present.

利用ASCA对早型星系的观测得到了以下新的结果：1. X射线谱由低温等离子体成分和硬成分组成。2.重元素丰度约为太阳值的一半。4.X射线亮度与等离子体组分温度之间存在正相关关系。对室女座星系团中心M87的ASCA观测结果表明：1. M87中的X射线等离子体由一个以星系团引力为边界的高温成分和一个以M87为边界的低温成分组成。2.在M87中心观察到了铁的视浓度。贫穷星系团所含的重金属被认为是从原始星系中喷射出来的。星暴星系就是这种早期星系的原型。对星暴星系M82的观测结果表明：1. II型SN合成的氧线较弱; 2.铁的丰度很低。3.富硅、富硫。4.结果表明，贫穷星系团中金属的起源不能简单地用星暴星系的抛射来解释。对z=0.194的遥远贫星系团MS 0839.8的观测结果表明：1.近、远星系团的温度和X射线光度没有差别; 2.结果表明，从z=0.2到现在，没有发生过强烈的演化。