Parkes observations for project P985 semester 2019APRS_01

We propose to use the ultra-wide-bandwidth, low frequency receiver installed at the Parkes telescope in order to quantify the broad-band intermittency time scale, polarization, quasi-periodicities, and mode changing of a newly discovered pulsar, PSR J1926-0653. The pulsar is unique in its emission properties. It has multiple pulse components, that change with time (both mode- changing and sub-pulse drifting phenomena are evident). The pulsar exhibits nulls in which a few individual pulses seem to be missing. It also exhibits longer-scale (hour-scale) intermittency behaviour in which the emission switches off for long periods of time. The pulse flux densities often, but not always, seem to exhibit quasi-periodic variations. Clearly this pulsar may hold the key to many different emission phenomena and we request time on Parkes, FAST and ATCA to parameterise the pulsar and its emission properties in detail.

我们提议利用安装在帕克斯望远镜（Parkes Telescope）上的超宽带宽低频接收机，对新发现脉冲星PSR J1926-0653的宽带间歇时标、偏振特性、准周期性及模式切换行为开展定量表征。该脉冲星的辐射特性独具特色：其包含多个随时间演化的脉冲成分，模式切换与亚脉冲漂移现象均十分显著；同时表现出脉冲缺失现象，似乎存在部分单脉冲未被观测到的情况。此外，它还呈现出小时级的长时标间歇行为，射电辐射会在较长时段内完全中断。其脉冲流量密度通常（但并非总是）表现出准周期性变化。显然，该脉冲星或可为揭示多种辐射现象提供关键突破口，因此我们申请使用帕克斯望远镜、500米口径球面射电望远镜（FAST）以及澳大利亚望远镜紧凑阵列（ATCA）的观测时长，以对该脉冲星及其辐射特性开展全面的参数化表征。