费米耀变体的伽马辐射与发射线辐射的相关分析（英文）

Correlation Analysis for γ-ray and Broad Line Emissions of Fermi Blazars

在活动星系核的标准模型中,中心有一个超大质量黑洞,黑洞周围是一个吸积盘,喷流处在垂直于吸积盘的平面上。理论研究表明,喷流和吸积盘之间存在一定的联系,许多学者利用射电(或伽马)辐射与发射线辐射之间的相关性研究这种关系。然而,耀变体的射电或伽马辐射具有强烈的成束效应,使得在讨论喷流-吸积盘的联系时,应该考虑成束效应。收集了202个FERMI/LAT耀变体的宽发射线数据研究喷流与吸积的关系。202个源中,66个具有多普勒因子。对整个样本和平谱射电类星体与蝎虎座BL型天体2个子样本,分别研究了去除红移影响和成束放大效应时,伽马射线与宽发射线以及射电波段与宽发射线的相关关系,得到整个样本202个源的伽马射线与宽发射线以及射电波段与宽发射线之间存在强的正相关,而且这种相关性在去除红移效应之后仍然存在。对于66个有多普勒因子的源,在去除多普勒因子的影响之后,伽马射线与宽发射线以及射电波段与宽发射线之间仍然存在正相关。分析结果表明:(1)整个样本和各个子类的伽马射线与宽发射线之间都存在强相关。这些相关性在红移效应去除后仍然存在,并且证实了文献中他们所研究的结果。(2)对于66个有多普勒因子的耀变体,宽发射线与多普勒因子之间存在强的相关性,伽马射线与宽发射线在去除多普勒因子的影响之后存在相关性。在射电和宽发射线之间也得到了类似的结果。(3)吸积过程与喷流之间存在强关联性。

In a standard model of active galactic nuclei(AGNs),there is a supermassive central black hole surrounded by an accretion disk with the jet coming out perpendicularly to the disk plane.Theoretical works suggest that there is a connection between the jet and the accretion disk.To investigate such a connection,people use the correlation between the radio emission(orγ-ray emission)and the broad line emission.However,it is well known that the radio(orγ-ray)emission is strongly beamed in blazars.In this sense,we should consider the beaming effect when we discuss the jet-accretion disk connection.In this work,we compiled a sample of 202 Fermi/LAT blazars with available broad line emissions.Out of the 202 sources,66 have known Doppler factors.The correlation betweenγ-ray and broad-line emission,and that between radio and broad-line emission are investigated by removing the effects of redshift and beaming boosting for the whole sample and the subclasses,flat spectrum radio quasars(FSRQs)and BL Lacertae objects(BL Lacs)respectively.Our analysis suggests that(1)There are strong correlations between theγ-ray and the broad line emission for the whole blazar sample and their subclasses.The correlations exist after the redshift effect is removed for the whole sample and their subclasses,confirming the results in the literatures.(2)For the 66 blazars with available Doppler factors,a strong correlation between the broad line emission and the Doppler factor is found.The correlation between theγ-ray and the broad line emission exists after the Doppler factor effect is removed.Similar results for 1 and 2 are also obtained between radio and broad-line emission.(3)Our analysis suggests a robust connection between the accretion process and the jet.