Parkes observations for project P1010 semester 2019APRS_04

We propose Parkes NAPA radio observations of PSR B1055-52 to be carried out simultaneously with approved X-ray observations by XMM-Newton. We will look for radio-X-ray correlations in the pulse behavior. In particular, we will search for a correlation of the X-ray pulse intensity with the very unusual quasi-periodic on/off change in the radio pulse intensity. These quasi-periodic changes on short timescale (about 20 periods) are also phase-locked between interpulse and main pulse, indicating global magnetospheric rearrangements. While radio-X-ray correlations have been detected in two older pulsars, they occur on much longer timescales. PSR B1055-52 provides a rare opportunity to search for the short-term manifestations of similar global processes in the radio and X-ray light curves. This radio- and X-ray- bright pulsar also shows some interesting long-term flux variability which we will investigate.我们提议针对脉冲星PSR B1055-52开展帕克斯（Parkes）NAPA射电观测，并将该观测与已获批的XMM-牛顿（XMM-Newton）卫星X射线观测同步实施。我们将探究脉冲行为中的射电与X射线相关性。具体而言，我们将搜寻X射线脉冲强度与射电脉冲强度极不寻常的准周期性通断变化之间的相关性。这类短时间尺度（约20个周期）的准周期性变化同时在副脉冲与主脉冲之间实现相位锁定，这表明磁层发生了整体重排。尽管此前已在两颗年老脉冲星中探测到射电与X射线相关性，但这类相关的时间尺度要长得多。PSR B1055-52为我们提供了难得的契机，得以在射电与X射线光变曲线中搜寻这类整体过程的短期表现形式。这颗射电与X射线均明亮的脉冲星同时还展现出若干值得关注的长期流量变化特性，我们将对此展开研究。