本文選題：BL　切入點：Lac　出處：《清華大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：我們在2010年的九月、十月和十一月以及2011年的九月和十月，利用清華大學(xué)—國家天文臺80cm望遠鏡（TNT），對BL Lacertae進行了總共16天的BVRI光學(xué)多波段觀測。 從光變曲線上可以看出，BL Lacertae在長時標(biāo)以及短時標(biāo)上都有明顯的變化。在2010年的三次觀測過程中，BL Lacertae相對平靜，每天的光變幅度在0.1個星等左右，而每次觀測的平均亮度先變亮約0.2mag又變暗約0.3mag。而2011年的兩次觀測中則非�；钴S，相比2010年同一時間段，BL Lacertae變亮了1mag；其中2011年9月的光變尤為突出，光變模式多樣，尤其是在2011年9月20日晚，目標(biāo)在R波段經(jīng)歷了一次幅度為0.3mag的爆發(fā)，這是整個觀測中光變最大的一次，而且每晚之間平均星等的變化也非常明顯。2011年10月5日觀測到了一次快速的光變過程，在不到1小時內(nèi)變化了0.1mag。 從光變曲線上可以看出，各波段的光變聯(lián)系緊密，，但也會有明顯的時間延遲現(xiàn)象。為了研究不同波段之間光變的時間延遲，我們選取了進行密集拍攝的3天的B波段和R波段的觀測結(jié)果，利用離散相關(guān)函數(shù)的方法進行分析，結(jié)果表明，其中有2天這兩個波段沒有明顯的延遲關(guān)系，而另外一天，即在2010年11月2日，B波段的光變要比R波段延遲約1000秒左右，即發(fā)生了硬延遲。這種硬延遲對于BL Lacertae來說是比較罕見的，這表明噴流中電子的加速與冷卻可能經(jīng)歷了與平常不同的物理過程。結(jié)合高能電子加速與冷卻時標(biāo)，我們估算出輻射區(qū)域磁場強度為5.2G。在色指數(shù)分析中，目標(biāo)在短時標(biāo)內(nèi)都會隨光度的增大而變硬，但在長時標(biāo)上，色指數(shù)比較平坦。 我們的研究結(jié)果表明，屬于中等能量峰的BL Lacertae在光學(xué)波段的光變形式與高能峰的BL Lac天體在X射線波段的光變形式非常相似，這種相似性暗示前者的光學(xué)波段光變與后者的X射線波段光變很有可能是來自于黑洞的同一區(qū)域，即噴流中相對論電子所產(chǎn)生的同步輻射中最高能的那一部分。
[Abstract]:On September, October and November of #datee and November and November of 2011, we have made a BVRI optical multiband observation of BL Lacertae for a total of 16 days by using the 80cm Telescope of Tsinghua University and National Astronomical Observatory. From the light variation curve, we can see that there are obvious changes in both the long time scale and the short time scale. During the three observations on 2010, BL Lacertae is relatively quiet, and the range of light variation is about 0.1 magnitude per day. The average brightness of each observation was about 0.2mag and then darkened about 0.3mag.However, the two observations in 2011 were very active, and the brightness of BL Lacertae was 1magg compared with that of 2010 at the same time. The light change in September 2011 was especially prominent, and the mode of light variation was various. Especially on the night of September 20th 2011, the target experienced an explosion of 0.3 mag in R band, which was the largest light change in the whole observation. And the change in the average magnitude is also evident every night. In October 5th 2011, a rapid light change was observed, with a change of 0.1 mags in less than an hour. From the optical curve, we can see that each band is closely connected, but there is also obvious time delay phenomenon. In order to study the time delay of light change between different bands, We selected the observations of B-band and R-band for three days of intensive shooting and analyzed them by using the discrete correlation function method. The results show that there is no obvious delay relationship between the two bands for two days, and the other day, In November 2nd 2010, the optical transition of B band was delayed by about 1000 seconds than that of R band, that is, the hard delay occurred. This hard delay is rare for BL Lacertae. This suggests that the acceleration and cooling of electrons in the jet may undergo a different physical process than usual. Combined with the high energy electron acceleration and cooling time scale, we estimate that the intensity of the magnetic field in the radiation region is 5.2 G. in the color index analysis, The target will become hard with the increase of luminosity in the short time scale, but the color index is flat on the long time scale. Our results show that the optical variation form of BL Lacertae in optical band is very similar to that of BL Lac object with high energy peak in X ray band. This similarity suggests that the optical band light variation of the former and the X-ray band light change of the latter are probably from the same region of the black hole, that is, the part of the maximum energy of synchrotron radiation produced by relativistic electrons in the jet.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P157.7

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本文編號：1639332