發(fā)布時(shí)間：2018-04-10 07:55

  本文選題：耀變體　切入點(diǎn)：多波段輻射　出處：《云南師范大學(xué)》2015年碩士論文

【摘要】：活動星系核中,有一類擁有極端物理性質(zhì)(相對論噴流、視超光速運(yùn)動)的星系——耀變體(Blazar)。從射電波段到高能伽瑪波段,耀變體的輻射都是連續(xù)的,一般認(rèn)為射電到軟X射線波段的輻射由同步輻射引起,但伽瑪波段的輻射機(jī)制一直以來都存在爭議,因此對耀變體伽瑪波段的輻射機(jī)制研究極為重要。本文主要以費(fèi)米源為研究對象,共選取了兩批耀變體樣本。第一個(gè)樣本內(nèi)共收集了78顆費(fèi)米二期的耀變體源在伽瑪波段(1-100Gev)的平均流量及譜指數(shù),1kev波段的高、低態(tài)流量及譜指數(shù)。利用這些數(shù)據(jù)對伽瑪射線與X射線的關(guān)系進(jìn)行統(tǒng)計(jì)分析,我們發(fā)現(xiàn):在高、低態(tài)下,γ射線與X射線流量間存在中度相關(guān);蝎虎天體的伽瑪射線與X射線譜指數(shù)間也存在中度相關(guān),但平譜射電類星體的伽瑪射線及X射線譜指數(shù)間沒有相關(guān)性。從這些結(jié)果中可以得到:高能γ波段的輻射機(jī)制更有可能是同步自康普頓輻射,并且蝎虎天體和平譜射電類星體的γ波段的輻射機(jī)制可能不同。第二個(gè)樣本內(nèi)收集了175顆耀變體源,其中有99顆被費(fèi)米觀測到(29顆BL Lacs和70顆FSRQs),對所有源的紅移、核光度、亮溫度、核主導(dǎo)參數(shù)、噴流向速度以及多普勒因子進(jìn)行統(tǒng)計(jì)分布研究,我們發(fā)現(xiàn):費(fèi)米耀變體的亮溫度、核主導(dǎo)參數(shù)、噴流向速度以及多普勒因子平均值都高于非費(fèi)米耀變體,子類FSRQs的各個(gè)參量也明顯高于BL Lacs。由此得到:Fermi耀變體比非費(fèi)米耀變體具有更強(qiáng)的相對論聚束效應(yīng),γ射線輻射跟射電輻射一樣,是多普勒增亮的,且γ射線輻射來源于噴流內(nèi)部,并且子類FSRQs與BL Lacs可能具有不同的噴流模型。
[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 緯 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 緯 band is more likely to be synchrotron from Compton radiation, and the radiation mechanism of 緯 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 緯 ray radiation, like radio radiation, is doppler enhanced, and that the 緯 ray radiation originates from inside the jet.And the subclass FSRQs and BL Lacs may have different jet models.
【學(xué)位授予單位】：云南師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P172.3;P157

【共引文獻(xiàn)】

相關(guān)期刊論文 前5條

1 孫艷春;天文專業(yè)基礎(chǔ)課的教學(xué)改革和全校天文公選課的設(shè)想[J];北京師范大學(xué)學(xué)報(bào)(自然科學(xué)版);2005年03期

2 王孝民;劉玲麗;;淺析近紅外光度與寬線區(qū)光度的關(guān)系[J];保山師專學(xué)報(bào);2008年02期

3 李林森;脈沖星的自轉(zhuǎn)能和磁輻射功率隨年齡的演變[J];東北師大學(xué)報(bào)(自然科學(xué)版);2000年01期

4 李小聰;太陽質(zhì)子事件、雙帶耀斑及日冕物質(zhì)拋射[J];地球物理學(xué)進(jìn)展;1999年S1期

5 楊祥;90年代天體物理對物理學(xué)的挑戰(zhàn)(續(xù))[J];大學(xué)物理;1997年09期

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本文編號：1730341