Parkes observations for project P985 semester 2019APRS_05

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.

我们拟使用安装于帕克斯射电望远镜（Parkes Telescope）的超宽带宽低频接收机，以量化新发现脉冲星PSR J1926-0653的宽带间歇时间尺度、偏振特性、准周期性与模式切换行为。该脉冲星的辐射特性极具特殊性，其拥有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。该脉冲星存在脉冲消隐现象，即部分单脉冲出现缺失；同时还表现出更长时间尺度（小时级）的间歇行为，即辐射会在较长时段内停止。脉冲流量密度通常（但并非总是）呈现准周期性变化。显然，该脉冲星或可为解析多种辐射现象提供关键线索，因此我们申请使用帕克斯射电望远镜、500米口径球面射电望远镜（Five-hundred-meter Aperture Spherical Telescope，FAST）以及澳大利亚望远镜紧凑阵列（Australia Telescope Compact Array，ATCA）的观测时长，以对该脉冲星及其辐射特性进行详细的参数化表征。