脈沖星同步—曲率輻射過程的研究
發(fā)布時間：2019-01-26 21:47
【摘要】：脈沖星是典型的銀河伽馬射線源,帶電粒子可在加速區(qū)內(nèi)被加速到相對論性能量,從而產(chǎn)生高能輻射。然而,加速區(qū)的位置、高能粒子的產(chǎn)生、輻射過程等物理問題一直不清楚�？赡艿睦碚撃Ｐ桶ㄍ忾g隙模型,該模型最初由鄭廣生教授等人于1986年提出,在后續(xù)的研究中,鄭廣生教授及其合作者考慮了同步-曲率輻射過程,不斷改進了模型。2014年Vigano詳細考慮了外間隙模型中的同步-曲率輻射過程,對模型進行更深入的研究,給出了更加緊湊的計算公式。在本文中,我們基于Vigano改進的同步—曲率輻射公式,對脈沖星外間隙模型中電子的輻射過程做了進一步的研究,并用Fermi衛(wèi)星給出的伽馬射線脈沖星觀測數(shù)據(jù)來檢測該輻射模型,主要包括如下內(nèi)容：1.根據(jù)電子的動力學方程進行了數(shù)值計算,給出了外間隙中運動電子的洛倫茲因子和投射角隨位置的變化；2.給出了電子垂直和平行部分的能量和動量變化,直觀呈現(xiàn)了電子早期從同步輻射到曲率輻射的過渡；3.利用改進的模型,運用LM方法擬合了33顆具有較好觀測結(jié)果的年輕脈沖星大于100MeV能段的相位平均譜；4.估計了年輕脈沖星的伽馬射線光度及轉(zhuǎn)化效率并與觀測對比,研究了伽馬射線光度、轉(zhuǎn)化效率、旋轉(zhuǎn)能損率和特征年齡間的相關(guān)性。研究結(jié)果表明單純的同步輻射或者曲率輻射都不足于描述帶電粒子運動過程中的輻射,考慮了同步-曲率輻射的外間隙模型可以解釋觀測結(jié)果。
[Abstract]:Pulsar is a typical galactic gamma ray source. Charged particles can be accelerated to relativistic energy in the acceleration region, resulting in high energy radiation. However, the location of the acceleration region, the generation of high-energy particles and the radiation process have been unclear. Possible theoretical models include the outer gap model, which was first proposed by Professor Zheng Guangsheng and others in 1986. In subsequent studies, Professor Zheng Guangsheng and his collaborators considered synchrotron curvature radiation processes. In 2014, Vigano considered the synchrotron curvature radiation process in the outer clearance model in detail, studied the model more deeply, and gave a more compact formula. In this paper, based on the improved synchrotron curvature radiation formula of Vigano, we further study the radiation process of electrons in the pulsar outer gap model, and use the gamma ray pulsar observation data from Fermi satellite to detect the radiation model. The main contents are as follows: 1. The Lorentz factor and projection angle of the moving electron in the outer gap are calculated numerically according to the kinetic equation of the electron. 2. The energy and momentum variations of the vertical and parallel parts of the electron are given, and the transition from synchrotron radiation to curvature radiation in the early electron phase is intuitively presented. Using the improved model, the phase average spectra of 33 young pulsars with good observation results are fitted by using LM method. 4. The gamma ray luminosity and conversion efficiency of young pulsars are estimated and compared with observations. The correlation between gamma ray luminosity, conversion efficiency, rotational energy loss rate and characteristic age is studied. The results show that both synchrotron radiation and curvature radiation are insufficient to describe the radiation in the motion of charged particles. The external gap model of synchrotron curvature radiation can be used to explain the observed results.
【學位授予單位】：云南大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：P145.6
本文編號：2415941
[Abstract]:Pulsar is a typical galactic gamma ray source. Charged particles can be accelerated to relativistic energy in the acceleration region, resulting in high energy radiation. However, the location of the acceleration region, the generation of high-energy particles and the radiation process have been unclear. Possible theoretical models include the outer gap model, which was first proposed by Professor Zheng Guangsheng and others in 1986. In subsequent studies, Professor Zheng Guangsheng and his collaborators considered synchrotron curvature radiation processes. In 2014, Vigano considered the synchrotron curvature radiation process in the outer clearance model in detail, studied the model more deeply, and gave a more compact formula. In this paper, based on the improved synchrotron curvature radiation formula of Vigano, we further study the radiation process of electrons in the pulsar outer gap model, and use the gamma ray pulsar observation data from Fermi satellite to detect the radiation model. The main contents are as follows: 1. The Lorentz factor and projection angle of the moving electron in the outer gap are calculated numerically according to the kinetic equation of the electron. 2. The energy and momentum variations of the vertical and parallel parts of the electron are given, and the transition from synchrotron radiation to curvature radiation in the early electron phase is intuitively presented. Using the improved model, the phase average spectra of 33 young pulsars with good observation results are fitted by using LM method. 4. The gamma ray luminosity and conversion efficiency of young pulsars are estimated and compared with observations. The correlation between gamma ray luminosity, conversion efficiency, rotational energy loss rate and characteristic age is studied. The results show that both synchrotron radiation and curvature radiation are insufficient to describe the radiation in the motion of charged particles. The external gap model of synchrotron curvature radiation can be used to explain the observed results.
【學位授予單位】：云南大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：P145.6
【相似文獻】
相關(guān)期刊論文 前6條
1 夏同生,張家鋁,陳次星;冪律能譜分布電子的同步-曲率輻射譜[J];中國科學技術(shù)大學學報;2001年01期
2 張家鋁，鄭廣生;Synchro－Curvature Radiation──彎曲磁場中一種新的、更普遍的輻射[J];天文學報;1995年04期
3 王沁;脈沖星表面磁層中電子運動的曲率輻射[J];新疆師范大學學報(自然科學版);1996年01期
4 楊建明 ,劉炯 ,張家鋁;彎曲磁場中相對論性電子輻射的自吸收性質(zhì)及等離子體影響[J];中國科學技術(shù)大學學報;2003年02期
5 鐘鳴,余觀夏,王惠明;相對論電子在螺旋磁場中的輻射[J];南京師大學報(自然科學版);2000年01期
6 ;[J];;年期
相關(guān)博士學位論文 前1條
1 劉炯;同步曲率輻射機制的物理特性[D];中國科學技術(shù)大學;2006年
相關(guān)碩士學位論文 前1條
1 陳顯亮;脈沖星同步—曲率輻射過程的研究[D];云南大學;2016年
，本文編號：2415941
本文鏈接：http://sikaile.net/kejilunwen/tianwen/2415941.html
教材專著
