Parkes observations for project P885 semester 2018OCTS_06

We propose to observe PSR J1622-4950 and 1E1547.0-5408 weekly, two\r\nof three magnetars known to currently emit radio pulsations, to\r\ntrack their rotation, flux density, and polarisation. Less frequently\r\nwe will monitor XTE J1810-197, which used to emit radio pulsations,\r\nto be on the lookout for its revival - as recently happened with PSR\r\nJ1622-4950, which turned on in 2017 after more than 2 years dormant!\r\nThese observations yield a continuous record of torque, illuminating\r\nthe continued release of magnetic energy. Our broader aims are to\r\ndevelop a better understanding of the dynamical behaviour of magnetar\r\nmagnetospheres, and to establish the conditions under which radio\r\nemission takes place therein, in addition to characterising their\r\nvariable radio emission in order to place constraints on the emission\r\nmechanisms, which in at least some respects differ from those of\r\nordinary pulsars.

本研究拟每周对已知当前可发射射电脉冲（radio pulsations）的3颗磁星（magnetar）中的2颗——PSR J1622-4950与1E1547.0-5408——开展观测，以追踪其自转状态、射电通量密度（flux density）及偏振（polarisation）特性。对于曾发射射电脉冲的XTE J1810-197，我们将以较低频率开展监测，以追踪其辐射复苏情况——正如此前PSR J1622-4950在休眠超2年后，于2017年重新激活射电脉冲辐射的案例所示。此类观测将获取连续的扭矩（torque）记录，从而揭示磁星磁能的持续释放过程。本研究的总体目标为：深化对磁星磁层（magnetosphere）动力学行为的理解，明确其内部射电辐射的产生条件；同时对其可变射电辐射进行特征刻画，以约束辐射机制——该机制在至少部分层面有别于普通脉冲星（ordinary pulsars）的辐射机制。