【摘要】：Vela衛(wèi)星在1973年觀測(cè)到了第一個(gè)伽瑪射線暴,自此我們知道了伽瑪射線暴是伽瑪射線在短時(shí)間內(nèi)突然增強(qiáng)的現(xiàn)象。隨著探索伽瑪射線暴的衛(wèi)星發(fā)射升空和越來(lái)越多的地面觀測(cè)站的建立,我們得到了更多伽瑪射線暴的觀測(cè)數(shù)據(jù),尤其是Swift和Fermi衛(wèi)星的發(fā)射升空,使我們進(jìn)入了研究伽瑪射線暴的新時(shí)代。本論文的研究主要集中在伽瑪射線暴余輝及其宿主星系的數(shù)據(jù)統(tǒng)計(jì)方面:首先,本文的第一章是伽瑪射線暴的概述,介紹了伽瑪射線暴的觀測(cè)歷史和全局分布,并概括了伽瑪射線暴的瞬時(shí)輻射和余輝的觀測(cè),以及由觀測(cè)數(shù)據(jù)得到的一些重要的經(jīng)驗(yàn)關(guān)系,同時(shí)也介紹了伽瑪射線暴的宿主星系及其分布。其次,本文對(duì)伽瑪射線暴的前身星、中心引擎模型和火球模型做了比較詳細(xì)的介紹。主要介紹了三種可能的中心引擎模型:NDAF模型、BZ模型和磁星模型,并概括了伽瑪射線暴的火球動(dòng)力學(xué)和標(biāo)準(zhǔn)的火球激波模型。前兩章是本人對(duì)伽瑪射線暴基本知識(shí)的學(xué)習(xí)與理解,是完成碩士期間各項(xiàng)工作的基礎(chǔ)。接下來(lái)是本人在碩士期間所做的一些工作。第三章主要介紹了GRB 110918A的多波段余輝數(shù)據(jù)擬合,考慮暴周圍環(huán)境為星風(fēng)和星際介質(zhì)兩種不同的情況,使用收集到的X射線、光學(xué)和近紅外余輝數(shù)據(jù),得到了光變曲線和余輝譜,以及兩組擬合參數(shù),通過(guò)對(duì)其初始洛倫茲因子、噴流張角等的限制,結(jié)合理論分析,判定GRB 110918A的中心引擎為BZ模型;第四章是探討活動(dòng)星系核(AGN)、太陽(yáng)耀斑和冷星的射電光度和X射線光度的成比例關(guān)系是否可以擴(kuò)展至伽瑪射線暴,我們統(tǒng)計(jì)了47個(gè)伽瑪射線暴的射電和X射線光度的數(shù)據(jù),發(fā)現(xiàn)通過(guò)擬合得到的伽瑪射線暴的射電光度和X射線光度存在類似的關(guān)系,表明不同尺度的天體很可能是相同的輻射機(jī)制;前兩項(xiàng)工作主要涉及伽瑪射線暴余輝數(shù)據(jù)的統(tǒng)計(jì)與擬合,而本人的第三項(xiàng)工作則是伽瑪射線暴宿主星系的數(shù)據(jù)統(tǒng)計(jì),而且我們建立了伽瑪射線暴及其宿主星系的“數(shù)據(jù)統(tǒng)計(jì)大表格”,我主要負(fù)責(zé)統(tǒng)計(jì)伽瑪射線暴宿主星系的形狀、offset、金屬豐度、絕對(duì)星等、AB星等、氫柱密度、消光、恒星形成率、年齡、質(zhì)量等數(shù)據(jù),并得到了8個(gè)關(guān)于宿主星系數(shù)據(jù)的統(tǒng)計(jì)直方圖,此部分工作列于第五章。最后,總結(jié)了本文的主要內(nèi)容,并且對(duì)伽瑪射線暴及其宿主星系研究領(lǐng)域中待解決的問(wèn)題做了展望。
[Abstract]:The first gamma-ray burst was observed by Vela satellite in 1973. Since then, we know that the gamma-ray burst is a phenomenon that the gamma ray suddenly increases in a short period of time. With the launch of satellites to explore gamma ray bursts and the establishment of more and more ground observation stations, we have obtained more observations of gamma ray bursts, especially the launch of Swift and Fermi satellites. This has ushered us into a new era in the study of gamma-ray bursts. This paper focuses on the statistical data of the afterglow of the gamma ray bursts and their host galaxies. Firstly, the first chapter of this paper is an overview of the gamma ray bursts, introducing the observational history and global distribution of the gamma ray bursts. The instantaneous radiation and afterglow observation of gamma ray bursts, as well as some important empirical relationships obtained from observed data, are summarized. The host galaxies and their distribution of gamma ray bursts are also introduced. Secondly, the star, center engine model and fireball model of gamma-ray burst are introduced in detail. This paper mainly introduces three possible central engine models: the BZ model and the magnetic star model, and summarizes the fireball dynamics of gamma ray bursts and the standard fireball shock wave model. The first two chapters are my basic knowledge and understanding of gamma ray bursts, which is the foundation of my master's work. The following is some of the work I did during my master's period. The third chapter mainly introduces the fitting of GRB 110918A multi-band afterglow data. Considering that the environment around the storm is starwind and interstellar medium, the light variation curve and afterglow spectrum are obtained by using the collected X-ray, optical and near-infrared afterglow data. According to the limitation of initial Lorentz factor and jet angle and theoretical analysis, the center engine of GRB 110918A is determined to be BZ model. Chapter 4 is to investigate whether the proportional relationship between radio and X-ray luminosity of (AGN), solar flares and cold stars in active galactic nuclei can be extended to gamma ray bursts. We have counted the radio and X-ray luminosity data of 47 gamma ray bursts. It is found that there is a similar relationship between the radio luminosity and the X-ray luminosity of the gamma ray bursts obtained by fitting, which indicates that the celestial bodies of different scales are likely to have the same radiation mechanism. The first two work mainly involves the statistics and fitting of the afterglow data of gamma ray bursts, while my third work is the statistics of the host galaxies of gamma ray bursts. And we've created a "big statistical table" of gamma-ray bursts and their host galaxies, and I'm mainly responsible for counting the shape of the host galaxy of the gamma-ray storm, the metal abundance, the absolute magnitude AB magnitude, the hydrogen column density, the extinction rate, the star formation rate. Eight statistical histograms of host galaxy data are obtained, which are listed in Chapter 5. Finally, the main contents of this paper are summarized, and the problems to be solved in the field of gamma-ray bursts and their host galaxies are prospected.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P172.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 徐明;黃永鋒;;伽瑪射線暴及其余輝研究進(jìn)展[J];天文學(xué)進(jìn)展;2012年01期

2 ;Optical Flash of GRB 990123: Constraints on the Physical Parameters of the Reverse Shock[J];Chinese Journal of Astronomy and Astrophysics;2002年05期

3 王祥玉,戴子高,陸W，

本文編號(hào)：2249892