射电源的流量密度与核主导系数的关系及相对论束流模型(英文)  

Relativistic Beaming Model and the Relation between Core Dominance Parameter and Flux Density for Radio Sources

作　　者：王永祥[1] 杨江河[2,3] 邵启湖[2] 

机构地区：[1]广州大学科技贸易技术学院 [2]湖南文理学院物理与电科学系 [3]广州大学天体物理中心

出　　处：《湖南文理学院学报（自然科学版）》2006年第2期22-25,共4页Journal of Hunan University of Arts and Science(Science and Technology)

基　　金：国家自然科学基金(10573005);广州市教育局重点学科;广州市科技局项目;湖南省教育厅科研项目(05C724);湖南文理学院科研重点项目(JJZD06005).

摘　　要：计算了2个河外射电源样本的核主导系数,并研究了核主导系数与核及延展元的流量密度的关系。结果显示：当核主导系数较小时,核主导系数与核流量密度线性相关；当核主导系数较大时,核流量密度与核主导系数没有相关,而与延展元流量有线性相关。因此,2个样本的这些关系依赖于流量密度与核主导系数,利用相对论喷流模型能解释用2个样本所得到的相关结果。The core-dominance parameter is calculated and investigated for the correlation with the core/extended flux density for two samples. But the two samples show different dependence of flux density on the core dominance parameter.Based on the relativistic beaming model, a relation between core-dominance parameter and the core/extended flux density is derived for extragalactic radio sources. The relations show that the core flux density is linearly correlated with the core-dominance parameter while the extended flux density is not correlated with core-dominance parameter when the core-dominance is lower than unity, and that the core flux density is not correlated with the core-dominance parameter while the extended flux density is linearly correlated with core-dominance parameter when the core-dominance is higher than unity. The relation obtained here can explain the different result obtained from two samples.

关 键 词：射电源 核主导系数 流量密度 相对论束流模型 

分 类 号：P157.7[天文地球—天文学]