大型射电望远镜脉冲星观测能力的模拟研究

发布时间：2018-05-18 15:47

本文选题：脉冲星 + 脉冲星分布　；参考：《新疆大学》2012年硕士论文

【摘要】：本文介绍了作者在硕士研究生阶段的三年研究工作。这些研究工作包括大型射电望远镜脉冲星观测能力的模拟研究。本文第一章主要叙述脉冲星分布的基本知识,特别是介绍Parkes多波束巡天(Parkes Multi-beam Pulsars Survey)对脉冲星探测结果,并Lorimer等人(2006)利用Parkes多波束巡天结果提出的脉冲星分布函数。另外,介绍国际上主要脉冲星巡天项目的基本情况和结果。本文第二章给出大型射电望远镜脉冲星观测能力的模拟研究的内容。本章首先采用Lorimer等人提出的脉冲星主要参数模型,根据Parkes多波束巡天与Parkes高银纬巡天发现的1059颗正常脉冲星和27颗毫秒脉冲星的实际情况,使用Monte Carlo方法,模拟得到脉冲星在整个银河系中分布的样本；然后,对该模型样本,通过设定射电望远镜各观测参数,进行虚拟探测,比较研究了一台虚拟的处于乌鲁木齐地理纬度上的110m口径射电望远镜与美国Green Bank天文台口径为100m射电望远镜(GBT)对脉冲星巡天观测方面的能力。特别分析了观测波段、积分时间、消色散终端参数、巡天天区等方面对巡天观测产生的影响,讨论了观测参数的优化选择问题。本研究结果显示,在共同可观测天区,在纬度42°处的110m口径射电望远镜搜寻脉冲星的能力比GBT的高约12%；该望远镜在银纬为|b|15°和银经为-60°l60°的天区范围内,选择在1100MHz～1500MHz之内的观测频率搜寻脉冲星效率最高；消色散终端的子通道带宽对正常脉冲星的搜寻选择1.0MHz,对毫秒脉冲星的搜寻选择0.1MHz为最佳；同时考虑增加极端消零脉冲星样本的需要以及巡天周期的限制,每波束积分时间可选择3600s。论文第三章,研究了建设中的FAST射电望远镜的脉冲星观测能力。
[Abstract]:This paper introduces the author's three-year research work at the graduate level. These studies include simulations of the pulsar observation capabilities of large radio telescopes. In the first chapter, the basic knowledge of pulsars distribution is described, especially the results of Parkes multi-beam surveys of pulsars, and the pulsar distribution function proposed by Lorimer et al. 2006) using the results of Parkes multi-beam surveys. In addition, the basic situation and results of the major international pulsar survey projects are introduced. In the second chapter, the contents of the simulation study on the observation ability of large radio telescope pulsars are given. In this chapter, the main parameter model of pulsars proposed by Lorimer et al is first used. According to the actual situation of 1059 normal pulsars and 27 millisecond pulsars discovered by Parkes multibeam survey and Parkes high silver latitude survey, the Monte Carlo method is used. Samples of pulsars distributed throughout the Milky way are simulated. Then, the model samples are detected by setting the observation parameters of the radio telescope. The capabilities of a virtual 110m radio telescope at Urumqi geographical latitude and that of the 100m radio telescope at the Green Bank Observatory in the United States for the observation of pulsar surveys are compared and studied. In particular, the effects of observation band, integral time, dispersion elimination terminal parameters, and daily survey area on the observation are analyzed, and the optimal selection of observation parameters is discussed. The results of this study show that in the common observable sky, the capacity of the 110m radio telescope at 42 掳latitude to search for pulsars is about 12 times higher than that of GBT, and the telescope is in the range of b15 掳silver latitude and -60 掳l 60 掳silver longitude. The efficiency of searching pulsars with observation frequency within 1100MHz~1500MHz is the highest, the subchannel bandwidth of the dispersion terminal is 1.0 MHz for normal pulsars, and 0.1MHz is the best for millisecond pulsars. At the same time, considering the need to increase the sample of extreme zero elimination pulsar and the limit of patrol period, the integral time per beam can be selected at 3600s. In chapter 3, the pulsar observation ability of FAST radio telescope is studied.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：P111.44

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