射电类星体黑洞自旋与射电噪相关性研究

An Analysis of Statistical Correlations between Black Hole Spin Values and Radio-Loudness Indices in Radio Loud AGN

黑洞自旋及其参量能提供射电类星体射电噪度的信息。从文献资料中收集了69个射电类星体源。这些源包含了37个陡谱射电类星体(SSRQs),32个平谱射电类星体(FSRQs)。通过样本数据研究黑洞自旋能量与射电类星体射电噪的相关性。研究结果表明:(1)37个陡谱射电类星体与射电噪存在明显的相关性。这种相关性在3种磁场条件下都存在(B=BEDD,B=104G,B∝j);(2)陡谱射电类星体与射电噪之间的相关性不受相对论聚束效应的影响;(3)32个平谱射电类星体与射电噪之间不存在相关性,这说明黑洞自旋与射电噪的相关性与射电类星体的类型有很大关系;(4)陡谱射电类星体黑洞自旋与射电噪的强相关性表明,黑洞自旋能量在一定程度上给出陡谱射电类星体射电噪度的信息。这些研究结果与其他人提出的理论是一致的。

We have collected a sample of 69 radio-loud quasars from various references.The sample includes 37 SSRQs （ with α〉0.5） and 32 FSRQs （ with α〈0.5） with redshifts ranging from about zero to about two.We have carried out an analysis of statistical correlations between black hole spin values and radio-loudness indices for the sample.In the analysis we consider three cases of the spin values.The three cases correspond to three different assumptions about the magnetic field strengths around the black holes.Our conclusions are as follows.（ 1） In SSRQs their black hole spin values are strongly correlated with their radio-loudness indices; （ 2 ） The correlation in SSRQs is not caused by relativistic beaming; （ 3 ） There is no indication of a strong correlation between supermassive black hole mass values and spin values for FSRQs;（4） The correlations between black hole spin values and radio-loudness indices may be different for different types of radio-loud quasars.Our results are consistent with models of radio -loud quasars of other authors.