Parkes observations for project P885 semester 2018OCTS_03

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.

我们提议对目前已知的三颗发射射电脉冲（radio pulsations）的磁星（magnetar）中的两颗——脉冲星（PSR）J1622-4950与1E1547.0-5408——开展每周一次的观测，以追踪它们的自转状态、流量密度（flux density）与偏振（polarisation）特性。我们将以更低频次监测曾发射射电脉冲的XTE J1810-197，以期捕捉其射电脉冲发射复苏的迹象——正如脉冲星PSR J1622-4950近期的经历那般：该星在休眠超2年后，于2017年重新开启射电脉冲发射。

此类观测将获取自转扭矩（torque）的连续记录，进而阐明磁星磁能的持续释放过程。本项目的更广泛研究目标包括：深化对磁星磁层（magnetosphere）动力学行为的认知，明确其内部射电发射的发生条件；此外，我们还将对磁星的可变射电发射特性进行表征，以此为射电发射机制施加约束——这类机制在至少部分层面上与普通脉冲星的发射机制存在差异。