【摘要】：隨著國(guó)內(nèi)外大型天文觀測(cè)設(shè)備的陸續(xù)投入使用,獲取的天體數(shù)據(jù)在時(shí)間、空間與頻率等方面都得到了極大擴(kuò)展.可以講,這是一個(gè)天文觀測(cè)數(shù)據(jù)爆發(fā)的時(shí)代.這些數(shù)據(jù)包含著豐富的信息,如何從海量數(shù)據(jù)中獲取有用的信息,這不光是天文學(xué)所面對(duì)的挑戰(zhàn),也是其它自然科學(xué)與社會(huì)科學(xué)需要共同應(yīng)對(duì)的難題.我們的研究,聚焦于宇宙中最為極端的變化現(xiàn)象,即Blazar天體的各波段光變,其變化時(shí)標(biāo)分布在從分鐘到上百年,變化率也橫跨多個(gè)數(shù)量級(jí),表現(xiàn)出極為豐富的變化模式.我們注意到,在金融、水文、地理、氣象、生物、社會(huì)等數(shù)據(jù)分析等領(lǐng)域，也存在著類似的變化現(xiàn)象.并發(fā)展出了大量有效的變化模型.我們希望將這些分析方法和模型應(yīng)用于Blazar天體的光變研究,探尋天體光變中的周期與非周期現(xiàn)象,建立適當(dāng)?shù)臄?shù)學(xué)模型.并尋求變化的物理原因,對(duì)Blazar天體光變的機(jī)制做觀測(cè)的限定,獲得合理的物理解釋. 我們選取了4個(gè)典型的Blazar天體,獲得了Fermi天文衛(wèi)星觀測(cè)的伽馬波段每日觀測(cè)數(shù)據(jù),結(jié)合當(dāng)代時(shí)間序列統(tǒng)計(jì)方法進(jìn)行了分析.在光變強(qiáng)度分布方面,我們確認(rèn)其符合對(duì)數(shù)正態(tài)分布.在變化的內(nèi)在聯(lián)系上,其表現(xiàn)為滑動(dòng)平均時(shí)間序列.基于以上分析,我們得到：獨(dú)立變化存在持續(xù)時(shí)間,但其影響不會(huì)延續(xù)太久,數(shù)據(jù)所表現(xiàn)的長(zhǎng)期相關(guān)性應(yīng)該是一種統(tǒng)計(jì)意義上的相關(guān).光變強(qiáng)度的對(duì)數(shù)高斯分布則暗示其變化有可能來(lái)自于相對(duì)論性噴流中可能的湍流現(xiàn)象. 基于以上嘗試,我們認(rèn)為,面對(duì)不斷增長(zhǎng)的觀測(cè)數(shù)據(jù),使用新型的純數(shù)據(jù)分析方法可以得到有數(shù)學(xué)意義的結(jié)果,可以對(duì)天體光變模式進(jìn)行識(shí)別和分類.但我們的目的是理解這些變化背后所蘊(yùn)含的物理.需要理解這些方法的物理意義,并最終與物理模型相結(jié)合.
[Abstract]:With the application of large astronomical observation equipments at home and abroad, the data of celestial bodies have been greatly expanded in time, space and frequency. It can be said that this is an era of astronomical observations. These data contain abundant information. How to obtain useful information from massive data is not only a challenge faced by astronomy, but also a difficult problem that other natural sciences and social sciences need to deal with together. Our study focuses on the most extreme phenomena of change in the universe, namely, the light variations in various bands of Blazar celestial bodies, whose time scales range from minutes to hundreds of years, and the rate of change also spans many orders of magnitude, showing extremely rich patterns of variation. We note that there are similar changes in areas such as finance, hydrology, geography, meteorology, biology, and social data analysis. And developed a large number of effective change models. We hope that these analytical methods and models can be applied to the study of the light variation of Blazar objects, to explore the periodic and aperiodic phenomena in the light variation of celestial bodies, and to establish appropriate mathematical models. The physical reasons of the change are sought, and the observation mechanism of the Blazar celestial body is limited, and a reasonable physical explanation is obtained. Four typical Blazar objects are selected and the daily observation data of gamma-band observed by Fermi astronomical satellite are obtained and analyzed with the statistical method of contemporary time series. In terms of light intensity distribution, we confirm that it conforms to the logarithmic normal distribution. In the internal relation of the change, it appears as the moving average time series. Based on the above analysis, we conclude that independent changes exist for a long time, but their effects do not last for long. The long-term correlation of the data should be a statistical correlation. The logarithmic Gao Si distribution of light varying intensity suggests that the variation may be due to the possible turbulence in relativistic jets. Based on the above experiments, we think that in the face of the increasing observation data, the new pure data analysis method can get the mathematical results, and can recognize and classify the celestial light variable patterns. But our aim is to understand the physics behind these changes. The physical implications of these methods need to be understood and eventually combined with physical models.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P11;P15

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相關(guān)期刊論文 前1條

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本文編號(hào)：2169287