Parkes observations for project P885 semester 2018APRS_05

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 just happened with PSR\r\nJ1622-4950, which turned on in April 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.

我们提议对已知当前可发射射电脉冲（radio pulsations）的三颗磁星（magnetar）中的两颗——PSR J1622-4950与1E1547.0-5408——开展每周一次的观测，以追踪其自转特性、流量密度（flux density）与偏振（polarisation）状态。对于曾发射射电脉冲的XTE J1810-197，我们将以较低频次开展监测，以期捕捉其脉冲辐射的复苏迹象——正如2017年4月，休眠两年多的PSR J1622-4950重新恢复射电脉冲发射那般！本次观测将获取自转转矩（torque）的连续记录，清晰揭示磁能的持续释放过程。我们的拓展研究目标包括：更深入地理解磁星磁层（magnetosphere）的动力学行为，明确其内部产生射电辐射的具体条件；此外还将对磁星的可变射电辐射开展特性表征，以此为辐射机制研究限定约束条件——这类辐射机制在至少部分层面与普通脉冲星（ordinary pulsars）的辐射机制存在差异。