项目名称: 测定脉冲星的位置和自行
项目编号: No.11463005
项目类型: 地区科学基金项目
立项/批准年度: 2015
项目学科: 天文学、地球科学
项目作者: 李琳
作者单位: 新疆大学
项目金额: 55万元
中文摘要: 利用新疆天文台南山25米射电望远镜对北天可见的脉冲星超过十年的常规的到达时间观测,我们将对到达时间的数据进行处理得到这部分脉冲星当前的位置和自行。我们可以通过两种不同的方法获得脉冲星的自行,分别是比较这些脉冲星经由南山数据得到的位置与脉冲星星表中给出的位置得到自行和直接拟合南山的数据得到自行。我们也将比较这两种方法获得的自行及星表和文献中公布的自行。超过十年的到达时间观测积累将使我们有机会对部分脉冲星的自行进行首次测定,也能对一些已有自行测量的脉冲星给出更加精确的自行数值。我们还将讨论在脉冲星位置测定过程中到达时间噪声和跃变产生的影响及由脉冲星自行推得的速度和它们在银盘的运动。由此获得的自行和速度分布对脉冲星的起源和在银河系前身星的分布能够给出清晰的信息。
中文关键词: 脉冲星;到达时间;位置;自行
英文摘要: We will measure the positions and proper motions of the northern visible pulsars from regular timing observations using the Nanshan 25-m radio telescope at Xinjiang Astronomical Observatory between 2002 July and 2013 December. Proper motions will be determined for these pulsars in two different ways, that is, by comparing the position obtained by fitting Nanshan data with the position given in the ATNF Pulsar Catalogue and by fitting the Nanshan data directly. We will compare the proper motions obtained in these two ways as well as the values published in the Catalogue and the literature. For some pulsars new proper motions will be obtained for the first time. Many checks on the correctness of existing proper motion values will give us the chance to provide the improved results. We will study the effect of the timing noise and glitches on the determination of pulsar positions. The investigation about the velocities derived from the proper motions and the motion in the galactic plane will be presented. The proper motions and the velocity distribution will clearly give information about the origin of pulsars and about the galactic distribution of the progenitor population.
英文关键词: pulsar;time of arrival;position;proper motion