本文選題：脈沖星　切入點(diǎn)：脈沖輪廓　出處：《西南大學(xué)》2012年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：脈沖星是宇宙中最神奇的天體,它的物理本質(zhì)、輻射機(jī)制等問(wèn)題幾十年來(lái)都沒(méi)有完全解決。脈沖星是相當(dāng)弱的射電源,但憑借其精準(zhǔn)的周期性,可將單個(gè)的脈沖按周期進(jìn)行疊加,從而便得到一個(gè)穩(wěn)定的積分輪廓,通常被稱(chēng)為脈沖輪廓。脈沖輪廓是脈沖星的直接觀測(cè)量之一,呈現(xiàn)出單峰、雙峰、三峰以及多峰等形態(tài)。人們建立了多種不同的射電輻射束的模型來(lái)解釋不同輪廓出現(xiàn)的原因,如核錐模型能夠形象解釋簡(jiǎn)單的單峰、雙峰及三峰輪廓的形成原因,但是這種模型卻不能解釋形狀不對(duì)稱(chēng)、復(fù)雜的多峰輪廓,于是人們提出補(bǔ)丁模型來(lái)進(jìn)行解釋,當(dāng)視線掃過(guò)多個(gè)排列不規(guī)則的補(bǔ)丁狀輻射束時(shí)便會(huì)產(chǎn)生復(fù)雜而多峰的脈沖輪廓。 本論文圍繞著脈沖星射電脈沖輪廓開(kāi)展了兩項(xiàng)工作：一是驗(yàn)證脈沖星射電脈沖輪廓中核錐成份寬度之間的關(guān)系；二是驗(yàn)證脈沖星射電輻射束半徑與脈沖周期之間的關(guān)系。 ●驗(yàn)證脈沖星射電脈沖輪廓中各種成份之間寬度的關(guān)系。前人基于核錐模型得出的結(jié)論是錐成份寬度為核成份寬度的0.7倍。為了驗(yàn)證這一經(jīng)驗(yàn)關(guān)系,我們收集并整理了33顆核、錐成份非常明顯的脈沖星。對(duì)這些脈沖星的積分輪廓進(jìn)行高斯擬合,分離出各個(gè)子成份,從而計(jì)算出核、錐成份的寬度及誤差。然后分別分析三峰和五峰脈沖星的核錐成份、所有這些核錐脈沖星的核和錐成份之間的關(guān)系。我們發(fā)現(xiàn)核錐脈沖星其核和錐成份的寬度并不存在前人總結(jié)的0.7倍的關(guān)系。 ●驗(yàn)證脈沖星射電輻射束半徑與脈沖周期之間的關(guān)系。前人做了不少相關(guān)的工作,得出不同的結(jié)論,或ρ∞P1/2或ρ∞P1/3。脈沖星的輻射束半徑是不可觀測(cè)量,但這個(gè)量與脈沖寬度、磁傾角、撞擊角之間存在著一定的幾何關(guān)系。前人多是假設(shè)磁傾角為90°而得出統(tǒng)計(jì)關(guān)系,我們收集了最新的數(shù)據(jù),在400MHz頻率段整理出40個(gè)核錐脈沖星數(shù)據(jù),在1400MHz附近有52個(gè)數(shù)據(jù),分別設(shè)定磁傾角的值為30°、45°、60°及90°脈沖寬度則選取W10、W50、Wpp。三種特征值來(lái)檢驗(yàn)前人的關(guān)系,我們發(fā)現(xiàn)脈沖輻射束半徑ρ與脈沖周間的分布下限關(guān)系更傾向于是ρ∞P1
[Abstract]:Pulsars are the most magical objects in the universe. Their physical nature and radiation mechanism have not been completely solved for decades. Pulsars are rather weak radio sources, but with their precise periodicity, A stable integral profile can be obtained by stacking a single pulse according to the period, which is usually called the pulse contour. The pulse contour is one of the direct observations of the pulsar, showing a single peak and two peaks. Different radio radiation beam models have been established to explain the causes of different contours, such as the nuclear cone model, which can explain the formation of simple single peak, double peak and three peak contours. However, this model can not explain the asymmetric shape and complex multi-peak profile, so a patch model is proposed to explain it. When the line of sight scans many irregularly arranged patch-like radiation beams, complex and multi-peak pulse profiles will be generated. In this paper, two works are carried out around the profile of the pulsar radio pulse: one is to verify the relationship between the width of the nuclear cone in the profile of the pulsar radio pulse, and the other is to verify the relationship between the radii of the pulsar radio radiation beam and the pulse period. In order to verify the relationship between the width of various components in the profile of the pulsar radio pulse, the previous conclusion based on the nuclear cone model is that the width of the cone component is 0.7 times the width of the nuclear component. We collected and sorted out 33 pulsars with very obvious cones. We fitted the integral profiles of these pulsars by Gao Si, separated the sub-components, and calculated the nuclei. The width and error of cone components. Then the nuclear cone components of three-peak and five-peak pulsars are analyzed respectively. We find that the width of nuclear and cone components of nuclear cone pulsars does not exist the relationship of 0.7 times as previously summarized. To verify the relationship between the radii and the pulse periods of pulsars, many related works have been done and different conclusions have been drawn, either 蟻 鈭，

本文編號(hào)：1645121