致密星的X射线辐射时延现象  

Time Lags in X-ray Radiation of Compact Stars

作　　者：屈进禄[1] 宋黎明[1] 吴 枚[1] 李年福[2] 

机构地区：[1]中国科学院高能物理研究所,北京100039 [2]吉林北华大学,吉林132000

出　　处：《天文学进展》2002年第2期144-157,共14页Progress In Astronomy

基　　金：国家重点基础发展规划(G2000776)资助课题;国家自然科学基金(19733003;19903004)资助课题

摘　　要：能谱仅反映了高能天体辐射的部分性质;而高能X射线辐射的时变可以反映致密天体的动态性质。因此,在构造高能辐射的理论模型时;既要考虑X辐射的能谱性质,也要考虑其时变性质。特别对高能天体X辐射的快速光变,一般认为其发生在致密天体附近,致密天体快速光变的研究可以揭示出致密天体附近的物理性质,因此,时变可以对X辐射模型给以很强的限制。X射线源不同能量光子到达观测者的时间差称为X射线辐射的时延。介绍了高能X辐射时变中的时延分析方法及其最新发展,综述了致密双星系统中黑洞侯选体和中子星的时延现象,并简单介绍了为解释这些现象所发展的模型,以及时延对模型的限制。The energy spectra reflect only the partial properties of high energy X-ray objects. Whilethe temporal variability reflects the dynamic properties of high energy X-ray objects. Both thespectrum and the temporal variability need to be considered when constructing the theoreticalemission models. It is generally accepted that the rapid variability of X-ray radiation origins inthe vicinity of the compact objects, and reveals the physical properties of the compact objects.Thus the temporal variability wi1l give a strong constraint on the emission models. In this paper,we review the temporal analysis technique of the time lag and its newest development, and theobservationa1 data, pay most attention to the properties of the temporal variability such as thetime/phase lags that hopefully can help us to discriminate between different theoretica1 models.We also discuss the models developed to account for the basic observational facts.

关 键 词：致密星 X射线辐射 X射线天文学 黑洞侯选体 准周期振荡 时变 时延 

分 类 号：P144[天文地球—天体物理] P172.2[天文地球—天文学]