Parkes observations for project P885 semester 2018OCTS_09

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.

本研究拟对目前已知的3颗可发射射电脉冲（radio pulsations）的磁星（magnetar）中的2颗——PSR J1622-4950与1E1547.0-5408——开展每周一次的观测，以追踪其自转、流量密度（flux density）与偏振（polarisation）。对于曾发射射电脉冲（radio pulsations）的XTE J1810-197，我们将以更低频次开展监测，以期捕捉其脉冲发射的复苏迹象——正如2017年PSR J1622-4950在沉寂超2年后重新激活的情况那般。此类观测可获取连续的力矩（torque）记录，以此阐明磁能的持续释放过程。本研究的核心拓展目标在于，深化对磁星磁层（magnetospheres）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，以此约束其射电发射机制——至少在部分维度上，该机制与普通脉冲星的发射机制存在差异。