本文選題：GPS源 + 活動(dòng)星系核　； 參考：《云南大學(xué)》2015年碩士論文

【摘要】：GPS源(Gigahertz-peaked spectrum sources)是一類射電結(jié)構(gòu)非常致密的射電噪活動(dòng)星系核(AGN),它們的射電譜峰值頻率在1GHz左右。GPS源的射電結(jié)構(gòu)線尺度一般在1kpc以內(nèi)。一般認(rèn)為GPS源是年輕的射電噪AGN,噴流活動(dòng)形成不久。根據(jù)高分辨率射電結(jié)構(gòu)確定的動(dòng)力學(xué)年齡為幾百到幾千年不等,噴流因此還沒(méi)有足夠的時(shí)間向外發(fā)展,但隨著時(shí)間最后會(huì)演化為大尺度的射電星系。因此,對(duì)這些源的研究有利于研究AGN活動(dòng)性的產(chǎn)生、AGN的演化、AGN的吸積和噴流之間的關(guān)系等AGN領(lǐng)域的眾多核心問(wèn)題。目前,GPS源的研究主要集中在射電波段,缺少光學(xué)等其它波段的研究,很多GPS源的紅移未知。本文的工作主要是挑選出一個(gè)GPS源樣本,使用麗江2.4光學(xué)望遠(yuǎn)鏡對(duì)樣本中的每顆源進(jìn)行光譜觀測(cè),同時(shí)結(jié)合已有的SDSS和其他望遠(yuǎn)鏡的光譜觀測(cè),從光學(xué)波段對(duì)這些射電源進(jìn)行細(xì)致的研究。 本文對(duì)AGN、GPS源和AGN光譜的相關(guān)背景做了介紹。利用麗江2.4米光學(xué)望遠(yuǎn)鏡對(duì)研究樣本中的每一顆源進(jìn)行光譜觀測(cè),使用IRAF進(jìn)行光譜數(shù)據(jù)處理,并將處理出來(lái)的最終光譜與SDSS和文獻(xiàn)中同一顆GPS源光譜進(jìn)行對(duì)比分析。我們發(fā)現(xiàn)GPS源星系在不同時(shí)間的光譜基本上沒(méi)有變化,這與星系噴流視角較大,光變不劇烈的說(shuō)法一致。而GPS源類星體Mrk0668在不同時(shí)間的光譜有明顯變化,我們認(rèn)為這可能是光變引起的。通過(guò)證認(rèn)研究樣本中未知紅移源MG1J180356+0340光譜中AGN特征發(fā)射線和吸收線,初步確定MG1J180356+0340的紅移為0.14。通過(guò)光譜擬合和測(cè)量連續(xù)譜和發(fā)射線參數(shù)(L和FWHM),我們確定了研究樣本中Mrk0668、HB891127-145和CGRaBSJ1424+2256這三顆源的中心黑洞質(zhì)量,并對(duì)它們的吸積模式進(jìn)行了分析。我們發(fā)現(xiàn)Mrk0668的吸積模式可能處于ADAF和標(biāo)準(zhǔn)盤的過(guò)渡期,而HB891127-145和CGRaBS J1424+2256的吸積模式可能是高吸積率的slim盤主導(dǎo)。我們還對(duì)Mrk0668的在不同時(shí)間的光譜變化進(jìn)行了分析。通過(guò)比較擬合測(cè)量不同時(shí)間光譜的譜指數(shù)、連續(xù)譜5100A處和發(fā)射線[OIⅢ]λ5007的流量,我們發(fā)現(xiàn)它的譜型變化較小,而連續(xù)譜5100A流量變化較大。通過(guò)對(duì)比譜指數(shù)和連續(xù)譜5100A流量,我們發(fā)現(xiàn)Mrk0668像大多數(shù)類星體一樣具有越亮越藍(lán)的趨勢(shì)(bluer-when-brighter trend:BWB)。為了更好的理解AGN寬線區(qū)的物理過(guò)程,我們還使用光致電離模擬代碼Cloudy模擬了AGN寬線區(qū)的輻射能譜,模擬結(jié)果與Ghisellini的結(jié)果一致。
[Abstract]:Gigahertz-peaked spectrum source is a class of radio noise active galactic nuclei (AGNN) with very compact radio structure. Their radio spectrum peak frequency is generally within 1kpc.GPS sources are generally considered to be young AGNs with jet activity forming shortly.The dynamic ages determined according to the high resolution radio structure range from several hundred to several thousand years, so the jet does not have enough time to develop outwards, but over time it will eventually evolve into a large scale radio galaxy.Therefore, the study of these sources is beneficial to the study of the evolution of AGN activity and the relationship between accretion and jet flow in AGN.At present, the research of GPS source is mainly focused on radio wave band, but lack of optical and other bands, many GPS sources are unknown redshift.The main work of this paper is to select a sample of GPS source, and use Lijiang 2.4 optical telescope to carry out spectral observation of each source in the sample, and combine the spectral observation of existing SDSS and other telescopes.These radio sources are studied in detail from the optical band.This paper introduces the background of AGN source and AGN spectrum.Using Lijiang 2.4m optical telescope, the spectrum of each source in the study sample is observed, the spectral data is processed by IRAF, and the final spectrum is compared with the spectrum of SDSS and the same GPS source in the literature.We find that the spectra of GPS source galaxies are basically unchanged at different times, which is consistent with the theory that the galactic jet has a larger angle of view and less intense light change.The spectra of GPS source quasar Mrk0668 have obvious changes at different time, which we think may be caused by light change.The AGN characteristic emission line and absorption line in the MG1J180356 0340 spectrum of unknown red-shift source in the sample were identified and the red shift of MG1J180356 0340 was determined to be 0.14.By means of spectral fitting and measurement of the continuous spectrum and emission line parameters L and FWHM, we have determined the mass of the central black hole of Mrk0668 / HB891127-145 and CGRaBSJ1424 2256, and analyzed their accretion models.We find that the accretion mode of Mrk0668 may be in the transition period between ADAF and standard disk, while the accretion mode of HB891127-145 and CGRaBS J1424 2256 may be dominated by slim disk with high accretion rate.We also analyzed the spectral changes of Mrk0668 at different time.By comparing and fitting the spectral exponents of different time spectra, the flux at 5100A of continuous spectrum and 位 5007 of emission line [OI 鈪 位 5007, we find that the variation of spectral type is relatively small, while the flux of continuous spectrum 5100A changes greatly.By comparing spectral exponents with 5100A continuous spectra, we find that Mrk0668, like most quasars, has a bluer-whenever bright trend: BWBN trend.In order to better understand the physical process of the wide line region of AGN, we also use the photoionization simulation code Cloudy to simulate the energy spectrum of the wide line region of AGN. The simulation results are consistent with the results of Ghisellini.
【學(xué)位授予單位】：云南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P161;P157.6

【共引文獻(xiàn)】

相關(guān)期刊論文 前1條

1 WANG JianGuo;DONG XiaoBo;;On the systematic bias in the estimation of black hole masses in active galactic nuclei[J];Science China(Physics,Mechanics & Astronomy);2014年03期

相關(guān)碩士學(xué)位論文 前4條

1 曹剛;Blazars高能伽馬射線的起源[D];中國(guó)科學(xué)院研究生院（云南天文臺(tái)）;2014年

2 孫曉娜;基于輕子模型研究GeV-TeV選活動(dòng)星系核噴流物理性質(zhì)[D];廣西大學(xué);2014年

3 熊定榮;活動(dòng)星系核超大黑洞質(zhì)量及多波段輻射特性的研究[D];云南師范大學(xué);2013年

4 康婷;TeV耀變體的高能伽瑪射線輻射研究[D];云南師范大學(xué);2013年

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本文編號(hào)：1768204