Parkes observations for project P991 semester 2019APRS_02

Finding radio pulsars orbiting near Sgr A* is a major goal of pulsar surveys with existing telescopes and future telescopes such as the Square Kilometer Array (SKA). The discovery of such pulsars will allow us to measure relativistic effects through timing of pulsars in tight orbits around Sgr A*, to characterise the distribution of dark matter near Sgr A*, to study the stellar population in the GC region and to probe the scattering region around Sgr A*. Although several surveys of the GC region have done, the Ultra-Wideband Low (UWL) receiver provides us a much wider frequency coverage with great sensitivity and therefore it is an excellent chance to revisit the GC region. At around 4GHz, a survey with UWL will achieve a sensitivity significantly higher than previous Parkes and Green Bank surveys, especially for pulsars with short spin periods and high dispersion measures.

寻找环绕人马座A*（Sgr A*）附近运行的射电脉冲星，是现有望远镜及未来望远镜（如平方公里阵列SKA）开展脉冲星巡天的核心目标。此类脉冲星的发现，将使我们能够通过对环绕Sgr A*的紧密轨道中脉冲星的计时测量相对论效应，表征Sgr A*附近暗物质的分布，研究银心区域（GC region）的恒星群体，并探测Sgr A*周围的散射区域。尽管已对银心区域开展了多次巡天，但超宽带低频（UWL）接收器具有更宽的频率覆盖范围和极高的灵敏度，因此这是重新观测银心区域的绝佳契机。在4GHz频段附近，使用UWL开展的巡天将获得显著高于以往Parkes和Green Bank巡天的灵敏度，尤其适用于短自旋周期和高色散量的脉冲星。