费米耀变体γ射线辐射特性研究

发布时间：2018-04-10 07:55

本文选题：耀变体　切入点：多波段辐射　出处：《云南师范大学》2015年硕士论文

【摘要】：活动星系核中,有一类拥有极端物理性质(相对论喷流、视超光速运动)的星系——耀变体(Blazar)。从射电波段到高能伽玛波段,耀变体的辐射都是连续的,一般认为射电到软X射线波段的辐射由同步辐射引起,但伽玛波段的辐射机制一直以来都存在争议,因此对耀变体伽玛波段的辐射机制研究极为重要。本文主要以费米源为研究对象,共选取了两批耀变体样本。第一个样本内共收集了78颗费米二期的耀变体源在伽玛波段(1-100Gev)的平均流量及谱指数,1kev波段的高、低态流量及谱指数。利用这些数据对伽玛射线与X射线的关系进行统计分析,我们发现:在高、低态下,γ射线与X射线流量间存在中度相关;蝎虎天体的伽玛射线与X射线谱指数间也存在中度相关,但平谱射电类星体的伽玛射线及X射线谱指数间没有相关性。从这些结果中可以得到:高能γ波段的辐射机制更有可能是同步自康普顿辐射,并且蝎虎天体和平谱射电类星体的γ波段的辐射机制可能不同。第二个样本内收集了175颗耀变体源,其中有99颗被费米观测到(29颗BL Lacs和70颗FSRQs),对所有源的红移、核光度、亮温度、核主导参数、喷流向速度以及多普勒因子进行统计分布研究,我们发现:费米耀变体的亮温度、核主导参数、喷流向速度以及多普勒因子平均值都高于非费米耀变体,子类FSRQs的各个参量也明显高于BL Lacs。由此得到:Fermi耀变体比非费米耀变体具有更强的相对论聚束效应,γ射线辐射跟射电辐射一样,是多普勒增亮的,且γ射线辐射来源于喷流内部,并且子类FSRQs与BL Lacs可能具有不同的喷流模型。
[Abstract]:Among the active galactic nuclei, there is a class of galaxies with extreme physical properties (relativistic jet, apparent superluminal motion).From the radio band to the high energy gamma band, the radiation of the glowing body is continuous. It is generally believed that the radiation from radio to soft X-ray band is caused by synchrotron radiation, but the radiation mechanism of the gamma band has always been controversial.Therefore, it is very important to study the radiation mechanism of gamma band.In this paper, Fermi source as the research object, a total of two batches of Yaoyue samples.In the first sample, the mean flux and spectral index of 78 Fermi second phase Yaohe sources in gamma-ray band 1-100 Gev) were collected, and the spectral index and the high and low state flux and spectral index of 1kev band were obtained.Using these data to analyze the relationship between gamma ray and X-ray, we find that there is a moderate correlation between 纬 ray and X-ray flux in high and low states;There is also a moderate correlation between gamma ray and X-ray spectral index of scorpion tiger body, but there is no correlation between gamma ray and X-ray spectrum index of flat spectrum radio quasar.From these results, it can be concluded that the radiation mechanism of high energy 纬 band is more likely to be synchrotron from Compton radiation, and the radiation mechanism of 纬 band of peaceful spectrum radio quasars of scorpion tiger body may be different.In the second sample, 175 yaw-variant sources were collected, of which 99 were observed by Fermi in 29 BL Lacs and 70 FSRQs, with red shift, nuclear luminosity, brightness temperature, nuclear dominant parameters for all sources.The statistical distribution of jet flow velocity and Doppler factor is studied. We find that the luminous temperature, nuclear dominant parameters, jet flow velocity and the average Doppler factor of Fermiyao variant are higher than those of non-Fermiyao variant.The parameters of subclass FSRQs were also higher than that of BL Lacs.It is concluded that the 1: Fermi yaw variant has a stronger relativistic spotlight effect than the non Fermi Yaw variant, that the 纬 ray radiation, like radio radiation, is doppler enhanced, and that the 纬 ray radiation originates from inside the jet.And the subclass FSRQs and BL Lacs may have different jet models.
【学位授予单位】：云南师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P172.3;P157

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