伽玛暴和Blazars的喷流辐射性质

发布时间：2019-05-28 19:36

【摘要】：本文首先简要介绍伽玛暴和活动星系核观测和理论的进展,然后给出我们将伽玛暴和blazars谱特点分析比较的结果。我们利用Fermi卫星发射以来到2014年4月Fermi/GBM仪器观测到的有红移测量的伽玛暴进行谱分析,得到一个具有38个源的样本。这些暴的时间积分谱以及最亮时刻的谱都可以用Band函数进行拟合,从而得到两种vFv谱中的单色峰值光度和相应的峰值能量分别为(Lps,Eps)、(Lpl,Epl)。我们发现最亮时刻的谱和时间积分谱的峰值能量是一致的。典型地,最亮时刻的单色峰值光度是时间积分谱的单色峰值三倍。时间分辨谱比时间积分谱的光子谱指数普遍的偏大,尤其是低能谱指数尤为明显。两种谱下的峰值能量和峰值光度关系(Ep-Lp)斜率在误差允许范围内大体是一致的。这些结果表明时间积分谱中的峰值能量很有可能是由峰值时刻的谱主导造成的。时间积分谱的谱指数不同于峰值时刻最亮的谱指数,很有可能是由于在单一的暴中它是由分辨谱叠加造成得到。我们基于在一个暴内谱存在演化以及流量和峰值能量的关系做的模拟,也支持我们的推测。这些结果表明时问分辨谱中的Ept-Ept关系很少受被叠加效应影响的,很有可能反映的是一种关于辐射机制内禀特征。基于前面我们所做的伽玛暴的谱分析,我们将其时间积分谱的峰值能量和峰值光度(Ep-Lp)与blazars的同步辐射的峰值能量与同步辐射的峰值光度(Es-Ls)放在同一个图中进行探究。我们发现伽玛暴的样本分布在较高的Ep、较高的Lp区域,Ep-Lp相关性较为紧凑,即平谱射电类星体和低峰频的BL Lac天体聚集在低Ep、低Lp的区域,有这些微弱的趋势：有越高的同步辐射的峰值光度Ls的源,其同步辐射的峰值能量Es就越低。中峰频的BL Lac天体和高峰频的BL Lac天体分布在Es～2×10-3-102keV Ls～1044-1047ergs的区域,而且没有发现Ls和Es的相关关系。我们从辐射物理机制上探讨其可能的解释：伽玛暴可能本质上是由于高度磁化的喷流中快冷却的电子同步辐射造成的。平谱射电类星体和低峰频的BLLac天体Es-Ls微弱的反相关关系,可能是由于中等磁化的喷流慢冷却电子同步辐射造成的,在L,-Ep上的分布也有可能是由于物质主导的喷流快冷却电子同步辐射导致的。这些表明伽玛暴和blazars在轻子同步辐射框架下相对论喷流的物理辐射机制为一个统一图像。
[Abstract]:In this paper, the observation and theoretical progress of gamma burst and active galactic nucleus are briefly introduced, and then the results of analyzing and comparing the characteristics of gamma burst and blazars spectrum are given. From the launch of Fermi satellite to April 2014, we used the gamma burst with red shift measurement observed by Fermi/GBM instrument to analyze the spectrum, and obtained a sample with 38 sources. The time integral spectra of these storms and the spectra of the brightest time can be fitted by Band function, and the monochromatic peak luminance and the corresponding peak energy of the two kinds of VFV spectra can be obtained as (Lps,Eps), (Lpl,Epl), respectively. We find that the peak energy of the spectrum at the brightest time is consistent with that of the time integral spectrum. Typically, the monochromatic peak luminance at the brightest time is three times the monochromatic peak value of the time integral spectrum. The photonic spectrum index of time-resolved spectrum is generally larger than that of time integral spectrum, especially the low energy spectrum index. The slope of peak energy and peak photometric relationship (Ep-Lp) under the two spectra is about the same within the allowable error range. These results show that the peak energy in the time integral spectrum is probably caused by the spectral dominance of the peak time. The spectral index of the time integral spectrum is different from the brightest spectral index at the peak time, which is probably due to the superposition of the resolved spectrum in a single burst. Our simulations based on the existence of evolution in a burst spectrum and the relationship between flow and peak energy also support our conjecture. These results show that the Ept-Ept relation in the time-resolved spectrum is rarely affected by the superposition effect, and it is likely to reflect an intrinsic feature of the radiation mechanism. Based on the spectral analysis of gamma bursts we did earlier, The peak energy and peak luminance (Ep-Lp) of the time integral spectrum and the peak energy of synchro radiation of blazars and the peak luminance of synchro radiation (Es-Ls) are investigated in the same diagram. We find that the samples of gamma bursts are distributed in the higher Lp region of Ep, and the Ep-Lp correlation is more compact, that is, flat-spectrum radio quasars and low peak-frequency BL Lac objects gather in the region of low Ep, and low Lp. There are these weak trends: the higher the source of synchrotron radiation peak luminosity Ls, the lower the peak energy Es of synchrotron radiation. The BL Lac objects with medium peak frequency and the BL Lac objects with peak frequency are distributed in the region of Es~ 2 脳 10-3-102keV Ls~1044-1047ergs, and no correlation between Ls and Es is found. We discuss the possible explanation from the physical mechanism of radiation: gamma bursts may be essentially caused by fast cooling electron synchro radiation in highly magnetized jet. The weak inverse correlation between flat-spectrum radio quasars and low peak-frequency BLLac celestial bodies may be caused by moderately magnetized jet slow cooling electron synchro radiation, at L, the weak inverse correlation between flat-spectrum radio quasars and low peak-frequency BLLac celestial bodies may be caused by moderately magnetized jet slow cooling electron synchro radiation. -the distribution on Ep may also be caused by matter-dominated jet fast cooling electron synchro radiation. These results show that the physical radiation mechanism of relative jet of gamma burst and blazars in the framework of lepton synchrotron radiation is a unified image.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P157.7;P142.6

【相似文献】