Parkes observations for project P885 semester 2017APRS

We propose to observe 1E 1547.0-5408 weekly, one of two magnetars\r\nknown to currently emit radio pulsations, to track its rotation,\r\nflux density, and polarisation. Less frequently we will monitor\r\nPSR J1622-4950 and XTE J1810-197, which used to emit radio pulsations,\r\nto be on the lookout for their revival. After years with unsteady\r\nradio emission, 1E 1547.0-5408 is now detected 100% of the time,\r\nallowing us to obtain a continuous record of its torque which\r\nilluminates the continued release of magnetic energy in the neutron\r\nstar. Our broader aims are to develop a better understanding of\r\nthe dynamical behaviour of magnetar magnetospheres, and to establish\r\nthe conditions under which radio emission takes place therein, in\r\naddition to characterising their variable radio emission in order\r\nto place constraints on the emission mechanisms, which in at least\r\nsome respects differ from those of ordinary pulsars.

本研究拟对目前已知的两颗可发射射电脉冲的磁星（magnetar）之一——1E 1547.0-5408开展每周一次的系统性观测，以追踪其自转特性、流量密度与偏振（polarisation）状态。我们还将以较低频次对曾发射射电脉冲的PSR J1622-4950与XTE J1810-197进行监测，以期及时捕捉其射电脉冲辐射的恢复迹象。在经历多年不稳定的射电辐射阶段后，1E 1547.0-5408目前已实现全时段可被探测，这使得我们能够获取其自转力矩的连续观测记录，从而揭示该中子星内部磁能的持续释放过程。本研究的总体目标包括：深入理解磁星磁层的动力学行为，明确其内部射电辐射产生的物理条件；此外，我们还将对这类天体的可变射电辐射开展特性表征，以约束其辐射机制——该机制在至少部分方面与普通脉冲星存在差异。